This may sound crazy but how's the flow out of your exhaust? Many years ago I had a clogged CAT on a car and it would build too much back pressure. Otherwise you may need to have in indie shop connect their computer to self test various components.
Chris
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1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
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