I always wanted a newer one with a lt1. I thought it would be fun to make a wagon fast. People are always shocked how fast my regal is. Would be just as fun beating mustangs in a big wagon. As far as your problem go's it wouldn't be your tb gasket, they idle up when they go bad. Same with a vac leak, unless its a big one. A bad map, will make it sound like it has a cam. So will the egr they stick, could idle up to. Inside the tbi at the bottom of the injectors there's a gasket that will leak, but would cause it run rich all the time. Same go's with the top gasket, where the pressure regulator is in. If you had a stuck open injector, chances are it wouldn't start. Since they run rich, during start up. You said you replaced the coolant temp sensor, that would have been my first guess. Did you look at the wire that go's into it? I would also take the tps out there plastic, on the pass side tb. They go bad. The groove from the tb pin becomes loose over time. If you check all of this including the o2, i would then look at the computer pins. Pull the harness off the computer and look for corrosion. I have seen distributors go bad with the plastic gear at the bottom has slop. When the computer go's to adjust the timing, they will run rough and rich. Same with the pickup module they will go bad from poor grounding.
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