The best way to try to fix this problem is to check the TPS voltage with the car off key on. With the butterfly closed the voltage should be at .99 volts. At wide open throttle the voltage should be no higher than 4.5 volts. Also make sure the cable is not kinked anywhere. How long have you had the new throttle body on? It can get sticky from the oil coming in through the valve cover breather from the fill cap. You may also want to get the air idle bypass plate that allows you to correct your idle without messing with the idle stop screw and TPS. Good luck I hope this helps a little.
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Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,
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