What causes 3500+ rpm miss?

jb89coupe said:

The TFI is the ignition module bolted to the outside of your distributer.. it's notorius for doing stuff like this, and I had one do a similar thing to me, it would buck and bog down around 3k.. replaced the module and the problem went away.

To set the TPS, just measure the vDC between the green and black wires coming off the sensor with the key on, engine off. You're looking for around .98v while the throttle is closed. To adjust it, loosen the two screws that hold it down and pivot the whole sensor until it's close to 1v without going over. You should also check the sensor for a smooth range throughout its sweep by opening and closing the throttle while keeping an eye on the voltage. If you have any dead spots or platues, it's probably time for a new sensor.

All you need to check codes is a paperclip or a small piece of wire. I can post a pic of the two connectors you have to bridge if you'd like.

It's not too likely that o2 sensors would cause such an rpm specific problem.

You should also check all your grounds.. a bad ground can cause weird problems like this too.

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