# Cylinders misfiring **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** tacoma, toyota\ **Created:** [March 24, 2010, 6:12pm UTC](https://community.cartalk.com/t/cylinders-misfiring/46581 "2010-03-24T18:12:08Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![exeagle](https://avatars.discourse-cdn.com/v4/letter/e/e0b2c6/32.png) [@exeagle](https://community.cartalk.com/u/exeagle)\ **Post date:** [March 24, 2010, 6:12pm UTC](https://community.cartalk.com/t/cylinders-misfiring/46581/1 "2010-03-24T18:12:08Z")
My 98 Tacoma V6 4X4 recently started running rough. It started with just a slight misfire. Yesterday, it was driving fine for about 5 minutes then became very rough. The check engine light came on so I had it diagnosed. Cylinders 1 and 2 misfiring along with a random cylinder misfire. Timing belt (chain) was replaced a few years ago so I don’t think thats the problem. Any ideas?? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [March 24, 2010, 6:36pm UTC](https://community.cartalk.com/t/cylinders-misfiring/46581/2 "2010-03-24T18:36:29Z")
Well, the first thing to worry about is the simplest - have a look at the ignition system components - plugs & wires at minimum. ---
**Author:** ![exeagle](https://avatars.discourse-cdn.com/v4/letter/e/e0b2c6/32.png) [@exeagle](https://community.cartalk.com/u/exeagle)\ **Post date:** [March 24, 2010, 6:44pm UTC](https://community.cartalk.com/t/cylinders-misfiring/46581/3 "2010-03-24T18:44:17Z")
I forgot to mention that it will run fine when I start it for about 3 minutes. Then the roughness begins ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [March 24, 2010, 9:12pm UTC](https://community.cartalk.com/t/cylinders-misfiring/46581/4 "2010-03-24T21:12:02Z")
I would start by making sure it’s up to date with all the maintenance specified in the owners manual. Then I would suspect ignition parts not changed on a scheduled basis, like the plug wires, coil(s) and ignition module. Next I would do a compression test and check out the EGR system.