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Dec 28, 2006 at 2:19 PM
Check fuel pressure first. Remove and clean the idle air control valve, and verify throttle position sensor voltage at closed and wide-open throttle. Also inspect for an exhaust restriction to rule out a clogged catalytic converter.
The owner reported a Mazda 626 that started, stalled immediately, then would not restart. After sitting a few hours it started again, stalled while reversing, and then would not start. Another user reported the same symptom. The expert advised checking fuel pressure, cleaning the idle air control valve, checking throttle position sensor voltages, and looking for an exhaust restriction such as a restricted catalytic converter.