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You can only keep your 1993 Pontiac grand prix se running if you press on the gas pedal once take foot off engine stops What is wrong?

The most likely culprit is a problem with the Idle Air Control (IAC) valve or its related circuitry. The IAC valve controls the engine speed when the throttle (gas pedal) is closed. If it's malfunctioning and not providing enough air to maintain idle speed, the engine will stall as soon as you take your foot off the gas. A sticking or dirty IAC valve is a common cause.
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