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Originally Posted by 1BadBowTie
Im stumped, even have a few people who are good with cars stumped on this one, a 99 1500 with 5.7 vortec, only misses after full throttle. after u get back on it again, it clears up. i also noticed it doesnt run extreamly smooth at idle.. i threw in a lot of fuel injector cleaner, new AC plugs, good set of carquest wires, cap, rotor, and still it does this... i also experiance poor gas mileage... roughly 12 mpg.... any ideas why this could be doin this???  |
This sounds like a leaking fuel pressure regulator to me. When you let off the throttle, the vacuum is higher at the fuel pressure regulator and extra gas gets into the intake causing the miss (the PCM sees the extra fuel and tries to lean it out). It would also explain the bad gas mileage.
//2000CAYukon