My s4 tII is occasionally bucking at high rpms. I havent done anything yet to it, but my first thought was maybe I have a plug wire failing at low load high rpms. Im going to change the wires and plugs in a few days. It happens between 4-5000 rpm and feels like a split second of power loss. This may happen about three or four times then once up to 5000 the car pulls real strong and has smooth acceleration. I know I should of changed the wires and plugs before I posted, but while I was waiting for the order to get here I was wondering what else this could be?

Any advice would be appreciated
Tomm

 

fuel pump,fuel filter,plugs eh ..?

 

Someone gutted out their cat recently and that fixed his problem

 

Check your oil man.

 

Problem solved;
Fuel cut defeder was just unconnected.

Thanks everyone,
Tom

 

problem fixed; it was just the fuel cut defender disconnected.

Thanks,
Tom

 

mine does this too on my 90 TII. were exactly do i fix that at.