Sludge build up on the throttle plate and/or idle air control valve can cause a poor engine idle, stalling, and/or hesitation – especially when the engine is still cold. The correction is to install a new idle air control valve spacer kit to prevent the sludge build up.
Poor Engine Idle, Stalling, Hesitation – Especially When Cold on Ford E-250
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If engine idle rolls up and down, and diagnosis rules out Idle Air Control (IAC) valve issues...