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Problem Reports » Problem With Idle Air Bypass Valve May Cause Engine Performance Problems

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Mercury Cougar

Report: Problem With Idle Air Bypass Valve May Cause Engine Performance Problems

Mercury Cougar Problem

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Model Year Affected: 1990

If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.

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