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1989 volvo 245dl automatic : drove car for 35 min in town, came to stop light sat for approx 2 min proceeded to take off and car lost power. The engine just stumbled as I was pressing on gas pedal, after a few sec. engine back to normal, what could be causing this? car has 3/4 tank of fuel I have cleaned throttle body, new fuel pressure regulator, cleaned Idle control valve, cleaned amm and air filter checked for vac. leaks and replaced defective throttle position switch. check test block and there are no codes.
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