First, when I start her up, I always let the engine warm up for a few minutes. When driving and getting over 40mph, the engine revs and drops, revs and drops. My foot is steady on the gas pedal. The revs are maybe 100rpm, nothing to make the car accelerate. After a few minutes of this, she levels out and runs steady. Anybody experience anything like this? Also, she runs really hot if I get stuck in traffic. I rigged up a way to vacuum the radiator and cleaned out the stuff that got sucked into the shroud. If I am moving, the temp is fine. Thanks!
Hunting RPM sounds like it could be vacuum related, maybe a small leak someplace.
Its also possible the throttle position sensor is dirty causing some low rpm fluctuation.
Overheating...how hot is it running? The colling fan switch doesnt turn on until coolant temp of around 230.
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