Question about 1996 Chevrolet K1500

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I have a 1994 Chev. C1500 2wd P/U 5.7 liter V8. Runs fine during daytime when good weather. At night or if there is a change in the weather such as rain, the truck stalls when stopping at a stop sign or stop light, and is very sluggish, acting like it will stall especially going up an incline in the road, the more the incline, the less power the truck has. I have replaced the plugs, wires, distributor cap, rotor, fuel filter, and M.A.P. Sensor. After replacing the M.A.P, Sensor it ran better during daytime, but at night it began the same problems of being sluggish while driving and stalling at stop signs. The check engine light came on and the diagnostic codes indicated the engine is running lean with no other codes indicating any other possible problems. Any ideas or solutions would be appreciated.

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Test the fuel pressure. With gauge connected to the fuel rail turn key on, listen for pump, when it stops,turnthe key off and leave gauge connected for an hour. The original reading should been 50lbs., if it drops any more than a couple of pounds the pump is bad. The M.A.P. sensor sounds like it was another item in itself.

Posted on Oct 16, 2010

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