Question about 1990 Ford F350

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Back fire while driveing

1990 F350 5.8 .. starts fine after installing new fuel pump it sat up for about 2 years but when i drive down the road it has no power an back fires alot i didnt drain old gas only had about 1/8 tank i just filled it with 91 oct an injector cleaner sits an runs ok revs ok some back fire in park but when in gear an driveing 45 mph is about it checked feul pres. is all fine an changed dist. cap an rotor if anyone has any ides id be grateful thanks

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  • suthrnboy Apr 11, 2009

    sorry it took so long to get back .. but thanks for your help i did have a few vacuum leaks but i ended up putting the truck in the shop as work had me to busy to look at it much .. so after replacing the fuel pump again removing fuel tank and cleaning it and replacing some injectors she is a power house once again ... oh the aftermarket fuel pump did not hold correct pressure i had to replace it with a ford dealer pump

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Check for vacuum leaks at your throttle body, intake manifold gaskets and vacuum line, or you could possibly have a sticking valve. if I am understanding you rite the truck sat for 2 years. also check the wiring to your sensors as for a rodent may have chewed some insulation off, this happened to my sons car.

Posted on Oct 12, 2008

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