It happens more on the highway than anywhere else. Its a 99 z28 6 speed. When I have the car on the highway in a high gear at a low rpm, lets say 6th gear at 65-70 mph, the engine starts hesitating as I get on the throttle. While this is happening my shifter starts violently shaking back and forth as if my engine were misfiring horribly. It doesnt happen while cruising at a constant speed and rpm, only while giving it gas. It doesnt matter if I ease into it gently or stomp the gas pedal to the floor. Has this happened to anyone else? If so what is the solution? If I had to guess I would say its an Intake manifold seal or something along those lines. Maybe even a TPS but I'm just wondering if anyone else has had this happen to them. Any help would be greatly appreciated.

 

Lets start with whats done on the car, last time maintenance was done, check engine light?, when did it happen.

 

I had a similar problem. It ended up being a bad injector. I think looking for vacuum leaks is a good start. If you have access to a good scan tool that would be a big help to check all your sensors.

 

It suddenly started one day as I was driving down the highway. My check angine light has come on before for o2 sensor circuit voltage. I replaced the MAF and that code went away but I still have this hesitation problem. Other than slp lid and exhaust my car is completely stock. I don't really have access to a good scan tool. I just think it's weird circumstances for this hesitation to be happening because it goes away at higher rpm.

 

Where are you in MA?

 

my money is on injector. Be sure theyre all plugged in as well!