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A bad TPS could cause you some problems. Have you tried backing out the idle adjustment screw a bit? 600 rpm idle is really low. I get about 950 both cold and warm, though maybe its 1000 cold.
If you want to come by sometime, I can pressure test your intake with my air compressor and that'll find any leaks you have.
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Stock 1988 951, TT aero wipers
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