Camaro_94

iTrader: (5)

Up until about 3500 rpm's, My car runs perfectly fine and theres absolutely no problems at all. I just replaced all the gaskets and spark plugs (because my head gaskets were leaking). When it gets up to about 4000 rpm's, its running real rough and doesnt want to keep accelerating, and just move up slowly, and its running pretty rough.

I'm not sure what this may be. Before my head gaskets went, I had this same problem. So i'm not sure what this is.

Any help would be appreciated!

thanks,
-Mike

Z28LS1camaroguy

iTrader: (3)

how are you 02 sensors?? my car ran like **** after 4k rpms and threw a SES light, then found it was the 02s and replaced them. And has ran awesome since, my tuner told me that you could lose 100 horsepower due to your 02s ****** up. check those and then see if that helps.

Camaro_94

iTrader: (5)

Thanks, I'll try checking them tommrow.

staringback05

iTrader: (8)

pre-gapped plugs?...no archs from wires?...check o2s, check fuel pressure....there ya go

Camaro_94

iTrader: (5)

All my gauges are fine. What do you mean by "no archs from wires" though?

wssix99

iTrader: (5)

Also suggest you get some MAF cleaner and clean your sensor. A dirty MAF can cause you to run lean under high load, giving you a hesitation.