Gp
I went through a similar problem with my '88 Firenza last winter... it's a different engine (2-liter OHC 4 with a throttle body), but this might help... I threw all kinds of parts at it... fuel pump, relays, sensors, computer, pickup coil, ign module... the car would start, run for 10 mins and quit.
It turned out to be the fuel injector itself... the little electric squirter on the throttle body. When it would warm up, it would start acting up... I finally found it by switching it out with a junkyard one after changing out all the other stuff mentioned above.
I'm sure your car isn't throttle-body, but am throwing this out in case it gives you or someone an idea. Good luck... my car never set a code and I had nothing to go on. I didn't read all the stuff here and in the other forum, but I take it you checked the spark?
(Someone mentioned timing chain, that could be a possibility too.) And the pros aren't necessarily pros - one local ****hot guy here kept insisting that my problem was the crankshaft position sensor... the Firenza doesn't have one! (I see somebody mentioned that as well, that could be it... I do know that that is a typical problem on the Buick V6 (3800).
Again, good luck!
D
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