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sounds like a problem with your IAC (idle air control) or tps (throttle position sensor). most likely the IAC because you have the problem at stops...
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'92 RS lt1/t56, lt4 hot cam, 30lb injectors, 54mm throttle body, full exhaust, 4.11 posi, 4 coil ignition, alluminum driveshaft, adj rear suspension, low. springs, electric water pump, custom tune.
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