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Re: Boost = Hesitation
OK so spark plugs and wires are ruled out. The vacuum reading seems to be OK normal range is 18 to 22 inHg and that could also give you an indicator of backpressure. If the vacuum is lower or keeps dropping more than usual then that would be an indicative of a plugged cat converter. However if you still want to check for backpressure that would be better.
Your problem might just be a coincidence between both things...
To be honest I'm not very familiar and obviously not an expert with superchargers, my GP doesn't has one. BUT as far as I know if the supercharger is dragging more air into the intake and the amount of fuel in the chambers is not the right one then your call will stall as the air to fuel ratio is not the correct one causing a lean mixture. So after that reasoning, either a fuel injector or fuel delivery problem should be the cause.
Hopefully one or more of the Grand Prix Masters in the forum will show up and give good advice about it.
Best regards,
Oscar.
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1995 Lincoln Town Car 4.6 Signature
1997 Pontiac Grand Prix GT 3.8
2000 Ford Windstar SE 3.8
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