Hi all… So I’ve consulted all my car people and the internet and still don’t know where to begin fixing my problem… Here is the problem: At about 40-50 mph when I’m just driving steadily (not actively accelerating) there is often a shudder/rumble strip type noise & vibration/slight jerk you can feel. It immediately stops if I let off the gas or if I give it more gas. It runs perfectly aside from this one issue.
Notes about the truck: AWD with options for manual selection 4hi & 4lo. V8 automatic trans.
Here’s what I’ve been told could be wrong:
Bad/low trans fluid
Trans filter needs to be changed
Dirty fuel Injectors
I have noticed that fuel injector cleaner seems to fix the problem for up to one day after I’ve added it to the tank, but after the first day it goes right back to doing it. A few days ago was my most recent add of injector cleaner, and it helped greatly the first day, but since then it seems to be “shuddering” more than what it has been previously. There are no errors or engine codes popping up, everything else works as it should, no leaks, no burning or using oil, etc.
So my question is do you have any ideas what might be causing this? Or where I should start with myself or having a shop diagnose things? Because the fuel injector cleaner seems to help I’m wondering if I should just replace one or more injectors? Or is that a waste of time/money?