My Bonneville is Possessed!!

disconnect battery for 10 minutes so the computer can reset. afterwords, drive car so computer can relearn system again.

Are there any codes stored in the PCM related to the transmission? When the car is bucking, is the tachometer oscillating at a rapid rate? The problem could be TCC, or transmission valve body related.

-- markwb

The tach stays rock steady during the bucking - re your other questions - I am not a mechanic, so you'll have to decode the rest of what you asked me for this non-mechanically minded redhead. :-) Thanks!

The tach stays rock steady during the bucking - re your other questions - I am not a mechanic, so you'll have to decode the rest of what you asked me for this non-mechanically minded redhead. :-) Thanks!

Your TCC (torque converter clutch) is probably slipping. In GM cars, it feels almost exactly like a misfire. The good news is that if you can stand on the gas and all is normal, you don't need a catalytic converter. The bad news is that you probably need a valve body.

I took the car to my mechanic and he did the following - tested the EGR tested the Torque Converter made sure the sparks and coils were OK

everything tested out with no problems, but my car is still having the problem -- what now ?? I am at my wit's end.

Well at least it isn't RE-possessed.

It does sound like an exhaust problem like the cat although if you go to the righ muffler shop with an after market cat you can get that work done for about $275 - $350 (not $900).