Join Date: Mar 2008
Location: LS/VTECin, GA
Feedback Score: 7 reviews
I would have to say at this point it might just be an older car developing some vibrations that it didn't have once before. I cringe if you have been replacing all the above listed items, just to rid the car of a pedal vibration, as that seems very costly. I don't know what "replacing your suspension" entails, but if you are doing it solely to get rid of the pedal vibration, I would not, take a step back. Try some free options (like tightening the pedal assembly as Dave suggested). It is likely a "free" fix, especially if you have new engine mounts (most cause of vibrations like these).
I would expect a dirty fuel filter/throttle body/etc.. to cause a vibration at idle. More specifically a drooping idle, which then causes the engine to run less smooth, resulting in a vibration or two. But at driving speed I don't see that as an affect, but I suppose its possible. It sounds like cleaned intake and fuel components are helping the issue.