I have a 1997 cavalier 2.2l. idles rough with constant misfire codes at idle but they stop at higher rpm, won't go above 35 mph. plugs, wires, coil pack, fuel pressure regulator all changed. catalytic converter removed (not plugged), idle air control valve working, egr working, compression check-all cylinders at 160, good fuel pressure, fuel filter good, no o2 sensor codes, valve cover removed all looks fine, no problems starting, bogs down when floored. any help would be greatly appreciated

 

How do you know the cat converter is not plugged? Did you connect a back pressure gauge up to the o2 sensor port? Did you check for a vacuum leak? Did you clean the MAF sensor?

 

I disconnected the converter from the exhaust on the front side, no vaccuum leaks found, don't know what a MAF sensor is

 

There is plenty of info of Mass Airflow sensors if you try a google search on it....also plenty of tips and tricks on youtube.

 

this car does not have a mass air flow sensor. any more suggestions. could it be the pcm, if so is there a way to test it

 

Have your fuel injectors flow tested, or remove them and soak them in carb cleaner for a while. Been there with a Cav, had that, along with a random misfire code they were causing. I wouldn't bother with the injector cleaner in the gas, I tried it and it didn't help at all. The injectors required "close personal attention".