TECH HELP!!! PLEASE?

Hello ToyHeadz,

I'll try to be as short and specific as possible here.
My Girl has this issue where when cruising at most any speed with the RPM'S around 2K, if I let of the throttle and re-apply slightly - the RPM's bounce between 1K and 2K resulting in a "juttering" until give her more gas.
I've replaced the TPS, set the timing to spec, and set the idle properly. My mechanic can't seem to figure this one out as it won't fu@kin! Do it when he road tests it.

Any help would be greatly appreciated!

Thanks!

 

This is why I like slightly more modern cars with the OBD2 standard. It's easy to watch what's happening with the computer while test driving.

My bet is on fuel. If not pressure (plugged filter or bad pump, maybe a regulator) then injectors. Really hard to say without being there.

 

I had an o2 sensor act like that. After I replaced it problem gone.

 

Thanks for chiming in! Much appreciated!