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hesitates bogging when accelerating bog down 900 1993

1993 940 4 cyl.turbo automatic..... for the last year this has happened 4 times. the car will be running fine and when i accelerate to pass a car or even just to pick up speed, the car will bogg down, tach will not go over 3500 rpm, like it's starving for fuel. i'll shut the car down for a few minutes and it will be fine for a few days to a few months. i replaced the plugs,fuel and air filter, outer fuel pump. i know it's not the fuel pump,i disconected each of them sep. and i can't duplicate problem, also new fuel pump relay installed. on 2 of the ocassions while driving i would shut the car off and put the key back on so the car would fire up again due to speed of vehicle and problem stopped..... might be a coincidence.






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