# Shuddering whle accelerating **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [May 12, 2009, 12:26am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346 "2009-05-12T00:26:15Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![colcrest](https://avatars.discourse-cdn.com/v4/letter/c/90ced4/32.png) [@colcrest](https://community.cartalk.com/u/colcrest)\ **Post date:** [May 12, 2009, 12:26am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/1 "2009-05-12T00:26:15Z")
'98 4runner with 164k miles. I notice the shuddering at about 20mph, but it becomes very pronounced at about 40mph. Mechanic told me I need all new suspension. Not sure this is the problem since it only happens on acceleration. It goes away the second I take my foot off the gas. Any ideas? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [May 12, 2009, 12:50am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/2 "2009-05-12T00:50:23Z")
Sounds more like bad drive shaft joints than suspension if it only comes with acceleration. The motor & transmission mounts should also get a good look. Did the mechanic drive it? Maybe you need another opinion. ---
**Author:** ![Xebadaih](https://avatars.discourse-cdn.com/v4/letter/x/d07c76/32.png) [@Xebadaih](https://community.cartalk.com/u/Xebadaih)\ **Post date:** [May 12, 2009, 1:43am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/3 "2009-05-12T01:43:06Z")
What did this mechanic mean by “all new suspension” exactly? ---
**Author:** ![colcrest](https://avatars.discourse-cdn.com/v4/letter/c/90ced4/32.png) [@colcrest](https://community.cartalk.com/u/colcrest)\ **Post date:** [May 12, 2009, 4:48am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/4 "2009-05-12T04:48:32Z")
New struts(shocks). Just doesnt make sense that I only get this when accelerating if that is the problem ---
**Author:** ![mark9207](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mark9207](https://community.cartalk.com/u/mark9207)\ **Post date:** [May 12, 2009, 5:07am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/5 "2009-05-12T05:07:42Z")
It sounds more like u-joints, as mentioned above, or a driveability problem in the engine or transmission, such as a misfire under load. If you decide to get that “all new suspension,” I would suggest getting an “all new mechanic” to do that for you, as well as diagnose this problem. ---
**Author:** ![chunky\_azian](https://avatars.discourse-cdn.com/v4/letter/c/f0a364/32.png) [@chunky\_azian](https://community.cartalk.com/u/chunky_azian)\ **Post date:** [May 12, 2009, 5:17am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/6 "2009-05-12T05:17:18Z")
A car this old may need new shocks. Can you hear the tires skipping as it shudder? Does the car bob a few times after you hit a bump? If the car doesn’t do neither of those, your shocks are fine. Manual or automatic? Clutch slip may cause chattering. As mentioned, bad joints may be the problem as well. ---
**Author:** ![colcrest](https://avatars.discourse-cdn.com/v4/letter/c/90ced4/32.png) [@colcrest](https://community.cartalk.com/u/colcrest)\ **Post date:** [May 12, 2009, 5:35am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/7 "2009-05-12T05:35:04Z")
When I took it in to get it checked out I specifically told them that I thought it was the u-joints. I am guessing that they never took the car out for a drive. When I hit bumps the still feels solid, doesn’t nose dive when I brake. ---
**Author:** ![colcrest](https://avatars.discourse-cdn.com/v4/letter/c/90ced4/32.png) [@colcrest](https://community.cartalk.com/u/colcrest)\ **Post date:** [May 12, 2009, 5:36am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/8 "2009-05-12T05:36:32Z")
Its an automatic. really dont think its my shocks, handles to well. ---
**Author:** ![mark9207](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mark9207](https://community.cartalk.com/u/mark9207)\ **Post date:** [May 12, 2009, 5:41am UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/9 "2009-05-12T05:41:23Z")
You need to find a good mechanic and have the car test driven. I don’t understand how any mechanic can see or hear those symptoms and not drive the car. The only times I DON’T do a test drive as part of my diagnosis is for symptoms like fluid leaks, no brakes, or won’t start, or a routine oil change. ---
**Author:** ![old4runnerdude](https://avatars.discourse-cdn.com/v4/letter/o/e9a140/32.png) [@old4runnerdude](https://community.cartalk.com/u/old4runnerdude)\ **Post date:** [May 22, 2009, 10:40pm UTC](https://community.cartalk.com/t/shuddering-whle-accelerating/30346/10 "2009-05-22T22:40:47Z")
Did you ever figure out what the problem was on this? I have a 4runner with 170K miles and its doing the exact same thing. I am also getting a very strong pulsating/shuddering when I apply the brakes. Anyone have any ideas?? thanks!