Fuel pump sound like a good place to start it may not be getting enough pressure to the fuel thus not sending enough of it at a time to explain why it runs good sometime i think it is primeing and filling the lines once it shuts off and so for a litle while it has enough gas but one you use the gas that was ready in the line it can't get enough to run correctly. have it tested.
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stalls when stop
My 2000 Impala die's when stop at traffic light...
Not sure if mine is a fuel problem but I'm having the same symptoms!! My engine light was on and a diagnostic check showed code PO742 Torque converter clutch circuit stuck in on position.
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