rpm don't go past 3500-4000 range

[theWeezL]

Originally Posted by mrnickleye

A plugged exhaust will create too much back pressure and wont let you rev up.

that was what was wrong with my 89. No power, idled smooth but couldnt get the engine to rev over 3000. It would overheat real fast too. If your car over heats at the same time, I recommend checking the exhaust for pluggage.