Ohhh the lumina stall/idle issue. This may not cure your problem but it did cure mine. Problem: eratic idle and stalling at red lights. first thing I did was drain a pint of tranny fluid and put a pint of Seafoam trans tune in. next, I replaced the tps and iac sensors "both located at the right of the intake manifold next to the pcv valve. they run between $30 and $40 each. be careful with the tps cuz there is a gasket that tends to take off flying when handled wrong. take the tps off first, then you'll be able to get to the iac right below where you took the tps off. go ahead and clean out your upper intake while you have these sensors off. NOTE: you have to properly fit the gasket on the iac before you put the sensor on, and you have to start with it turned away from you a bit so it catches the joints on the inside. be VERY carefull not to drop any of the bolts, its a bad place to drop one. Once you have everything back together, drive the car a couple days so the Trans tune can properly coat the tcc in the tranny. Then get your tranny flushed. Once I did this, it idles at 700rpm and it hasnt stalled since. Hope this will do the same for you. let us know...
tpc = throttle positioning control
iac = idle air control
tcc = torque control clutch