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FOUND OUT SOMETHING NEW. CAR WILL RUN FINE WHEN IT IS FIRST CRANKED UP, BUT WHEN IT GETS A LITTLE WARM IT WILL START TO MISS. STILL ONLY WHEN YOU HOLD THE RPM STEADY. STILL IDLES FINE AND REVS FINE.
I'd have to say something in the ignition system like a crank or cam sensor. Have you pulled the plugs to see if any of them look like they are misfiring?
Had a 94........would hesitate only at certain rpm's. Was not the pcm, cam or crank sensors!
Turned out to be a charred wire in a wire harness too close to the exhaust. Not a plug wire.