My 3.8L buick gran sport will run terrible after it stalls

and thats all you did? did you remove and replace the plug wires one at a time???

what is it idling at? could need to be raised in the rpm area...or bad gas or?...see mechanic

When my 94 Regal GS frequently wouldn't start for 30 minutes to an hour after being driven, it was the crankshaft positioning sensor that needed to be replaced. I also replaced the harmonic balance pulley. The car ran more smoothly and started everytime.

it could be as simple as drilling holes in your catalytic converter or replacing them. Alot of these symptoms show up because of a plugged cat. converter or fried o2 sensors

go the cheapest route. replace fuel filter and add SEAFOAM to tank of premiun fuel. replace filter before 500 miles. then add SEAFOAM to gas every 3000 miles to keep lines.engine,fuel pump, and emissions systems clean, ETHANOL problem number 3000

Just a fixya is much appreciated

Check the Tension on the Belt. If it is even a Little loose it will not allow the Battery to Charge. Check the Alternator Also.

Clean The Idle Air Controler

You could possibly have a blown head gasket. Is there an awful amount of white smoke coming out of the tailpipe? If so, that's likely to be your problem.

sounds like the same thing that was wrong with the 94 GS i recently bought. found the crankshaft postion sensor to be bad. it controls your electronic spark timing which would allow it to turn over with out starting.
also does your stall when you are stopped and at idle or while at driving speed or both? mine would stall at idle and driving speeds. Changed that sensor and have not had any more issues with stalling. sensor should cost around $30-$40 dollars at your local autozone, takes about 2 hours to change just need to pull the harmonic balancer pulley (make sure to use the proper tool or you will bend the pulley) and the sensor is behind the pulley. you will gain easier access to doing the maintenace buy removing the passenger front tire and the little splash gaurd directly behind the tire held on by 3 quick release fasteners. hope this helps you out.