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I have a Olds Cutless Ciera 1089 with the 2.8 MFI V6, and my car was stalling more and more coming to a stop. It would always start right up, but as soon as I put in back in drive many times would stall again. You can try to prove that it is the Lock up clutch converter solenoid which is inside of a side cover on the drivers side. I unplugged mine and the problem went away for good. Per a GM dealership shop tech, said It won't hurt anything for a while. He said it wasn't urgent to fix a sticking solenoid, for weeks or months, but should fix it sometime. You might lose some of the gas mileage from unplugging it, no lock up at upper speeds. Old school cars never even had these, and they were plenty problematic in GM cars, of getting stuck or staying sticky. Hope this helps.
Have your fuel injectors checked !!.When they start going bad one or more will short out ,then the quad driver in the computer which controls injector pulse will shut down until it cools off a little.Then you can start your car .:)
I would look to see if you got a broken ground wire!!! witch are a big thing on todays computered cars. I know you have dumped a lot of money in your lawn ornament but one unhooked or dirty ground wire not making a connection can reak havick with everything, I would chk.for ground issues like around the fuel tank and where they hook to engine to body to frame or k-member.
Basically the easiest way for you would be to test your voltage when vehicle is off & record it. Shut all accessories off, Now start the vehicle & check voltage while running, it should come to say 13.5 approx. which would indicate that it is charging. One other thing I'd be tempted to try, is hook test light to good ground & then touch negative terminal while it's off the battery, just to make sure there isn't a wiring mix-up sending current back to negative. If light lights up, somehow power is getting fed back through ground, time to look for that source. Do it with key on & off just to be sure. Don't you just love it when someone plays with wiring and you need to figure out what the heck they did?