Thread: 87 f250 vacuum leak at manifold 351w 4v
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Old 12-21-2005, 04:24 PM
sjcrft sjcrft is offline
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Re: Re: 87 f250 vacuum leak at manifold 351w 4v
Quote:
Originally Posted by Crasen
have you tried cleaning out the EGR valve? If the EGR valve is stuck slightly open it can cause the engine to idle like it is a vacuum leak with a lean misfire when it is in fact a density misfire from the EGR valve allowing exhaust gas to enter the intake at idle.

egr gone with the old intake and it it carb not efi
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