150,000 mile second car that I use to save gas. Ran fine, then quit suddenly. Replaced distributor and coil assembly, started, but ran terrible when cold. Took it to my mechanic and he said I busted temperature sensor when I was cranking down on the distributor hold down bolts. Ok, a new sensor and $110 later it ran fine.

It ran fine for almost 500 miles and then started bucking on deceleration. It will accelerate all day long and I can (almost) maintain speed with no problem. But the minute I back off on it slighly, the whole car rumbles violently. So much so, that I need to push in clutch or floor the gas. So, its either floor it or let off the gas completely.

Anybody have an idea? Thanks in advance.

 

Well, no takers, so I took it to my mechanic. I will post for all to see when I get it back.