redmaro91

My 1991 Camaro z-28 will not run right when i am going down the road. It seems that when my rpms get high enough the engine starts losing power and the rpms slowly drop until i let of the gas. Then I have to put it in neutral and let the rpms go down until it is idling. Then I shift into drive and it acts normal until I get into high rpms. The longer it keeps running the faster it acts up. I have changed the fuel pump, fuel filter, fuel pressure regulator, oil pressure regulator, oil, oil filter, MAP sensor, positioning sensor, Eg air valve, rotar button, distributor cap, spark plugs(wires),pickup coil, the sensor under the distributor cap, oxygen sensor, and the computer, and it still has not worked yet. Is there anything I could possibly do.

QuickStyle

catalytic converter.... same symptoms i had on my old 89 iroc, put a "test pipe" in its place, and it felt like a brand new car, and sounded better too. i recomend replacing the cat with a high flow cat. you can get under your car and hit the cat with your palm hard, and if its rattling, 100% replace it. but if it doesn't rattle, it could still be bad.

redmaro91

thanks for the tip. I will try it out

redmaro91

it still didn't work. I cut the cats out and put in straight pipe. I put it on a computer and it says that my exhaust is rich. also it reads that the temp is -34 degrees.

CEP89

Replace the coolant temp sensor. What about any codes? By high RPM what number do you mean? Have you taken a look at your spark plugs?

redmaro91

would it have anything to do with my computer? It happens around 2grand or so