I have a 1985 4.3 (Z) with no fault codes. Stalls when placing it in drive

1985 CHEVROLET MONTE CARLO
130 MILES
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DAVE FISHER
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The engine stalls under load (Placing it in Drive). Transmission is a 700-R4 and has a pressure switch for the converter lock out bypassed. Replaced EGR, TPS, EAC and Intake Gasket.

Ground from sensor to PCM? If so need to find the ground pin outs
Dec 7, 2011 at 4:36 PM
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WRENCHTECH
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First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
Dec 7, 2011 at 5:14 PM
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RASMATAZ
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Disconnect the TCC solenoid and see what happens
Dec 7, 2011 at 5:19 PM
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DAVE FISHER
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Replaced IAC and Injectors and cleaned throttle plate and body. Fuel pressure is very good. Vacuum holds steady in park.
Dec 7, 2011 at 5:26 PM
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