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on my 91 camaro 3.1 its been idling really rough. The Rpm gauge jumps from 1000 ro 750 really fast. I was thinking it was a timing issue but when i unplug the computer from the engine (the tan wire) it idles fine. Not really smooth but alot better than when it had the computer on it. What do you think this could be?

also driving down the road today it just died on me. i was goin about 30 and everything just went dead. What could have caused this?
 

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Any engine codes? Have you changed anything?

Id reset base timing and take out and clean your Idle air control valve to start. Also check for any vacuum leaks. Check fuel pressure.

To diagnose a problem like this more often than not you need some sort of sensor scanner so you can get readings on what the sensors are doing.
 
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