Are you going through State inspection or are you going to your local garage? One trick I know works pretty well is to turn the AC (if you have it) on full blast and test it then. Other than gas additives that's all I really got for ya. Hope it helps... 
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Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump
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