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My car was stumbling .I found a vacumn leak at the fuel pressure regulator fixed it and disconnected the O2 sensor, Better but still stumbling. Used fuel injector cleaner.Better for a short time. Finnally I cleaned and oberved the AFM. then I cleaned and inspected the large connector near the wiper motor. I resat the fuel pump relay and changed to a non locking vented gas cap and the car now runs steady.
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