Quote:
Originally Posted by PCH
You can open the throttle slightly and spray some carb cleaner into the vacuum line going to the intake manifold. If the revs pick up and engine smooths out then you have fuel delivery issue. How is the intake vacuum at idle?
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Not necessarily because you've created an air leak by pulling the vacuum hose off - this may also increase the fuel rail pressure as well and then you're correcting it by spraying additional fuel (carb cleaner) into a lean running engine. Sadly not a conclusive test for this reason.