under load missing
My 88 c1500 w/ 5.7 misses under load. Plugs and wires are new. what else could cause this?
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Is it carb'ed?
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Do a compression test.
Allan |
Throttle body injection. Truck has 318,000 miles on it. Original coil(could this be the culpret?). I rebuilt engine at 152,000. Don't remember if I replaced distributor cap. Plan on checking it out. Just drove the truck this morning and it ran fine for a while(two legs of about 3 miles) but when backing it in driveway it started missing.....somewhat of a different deal since it wasn't really under load. Guess I will have to do a compression check. Real pain with the headers I have on it! Another piece of puzzle, MAP sensor is only 8000 mi. old. Was told by a mechanic that MAP and trottle position sensor are only 2 sensors that affect the way it runs under load. Can a MAP go bad that quick?
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What you are describing sounds like fuel schedule, but that usually is a problem from the git go. However, electronics can do goofy things when the heat up. The map sensor, was it new, and not el cheapo?
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How long has it been since you replaced the fuel filter?? My 97 silverado 5.7 did this and I replaced the filter and it runs great now
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