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Old 06-26-2013, 12:04 PM
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Tomguy Tomguy is offline
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The MAP controls overall mixture too, including idle, from my understanding of the primitive system - which is why there's an idle mix wheel, once you get load mix right, you then need to set idle mix.

I second Al's opinion, your ECU might be toast. It's not common but it's quite possible. Other causes could be leaking injectors (dribbling or pouring gas into the engine when they should be closed), major vacuum leaks, or other issues.

Does your door lock system work? If not, plug the vacuum source line. Brake booster should hold a good vac for a while after shutting off the engine. Wait like 5-10 mins and crack the line open, it should release a fair vacuum. The transmission sources its vacuum from the engine for the shift points & pressure, that line may be disconnected or rotted under the car. This is all in addition to the MAP hose itself, of course, and the rubber bits for the idle air circuit.
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