1993 Chevy Lumina 6 cyl Front Wheel Drive Automatic
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My car is stalling once it warms up and I take my foot off the gas to make a turn or slow for traffic.It also happenes when I put it in reverse.Computer reads no errors. The fuel pressure has been checked,throttle body cleaned,no vac. leaks,fuel injector cleaner added.

Inspect and test the idle air control valve,throttle postion sensor/MAF/MAP sensors to include the EGR valve.

possibly tcc lockup as well. try the old seafoam transtune trick. see if it helps. if not, im leaning toward egr. clean it out, hose too, new gasket. doesnt cost much to clean and its worth a shot, specially before you dive into a big repair bill...