Bucking 90 4.9
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08-05-2007, 09:42 AM
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Bucking 90 4.9
I have a 1990 F150 with a 300 and a 5-speed. My problem is a bucking or stumbling on light acceleration or when pulling, especially when pulling a load. I have changed the fuel pressure regulator, ECM, PIP sensor, TPS, distributor cap, plug wires, rotor, plugs, fuel filter, and 6 months ago the EGR valve. Any suggestions would be appreciated.
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