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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,402
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Look for air leaks from the turbo to the throttle body (turbo compressor exit piping, intercooler O rings, and any associated hoses attached to the intercooler). I'm presuming this car has the stock CIS fueling system (hasn't been converted over to electronic fuel injection). Your symptoms make me think of air leaks, so confirm good fittings before doing much else.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ.
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