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Registered
Join Date: Jul 2001
Location: Wilmington, NC USA
Posts: 635
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Classic systems of a vacuum leak. Check that new pop valvae. Make sure it is sealed well and hasn't started leaking air. For hesitation on acceleration the Probst manuel list these probable causes:
Vacuum Leak(intake air)
Fuel injectors clogged.
Cold Start valve leaking
Air-flow sensor plate out of adjustment.
Fuel pressure incorrect.
Idle mixture incorrectly adjusted.
Good luck
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69 911 2.3Ez
85 928S
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