Have replaced plugs, cam sensor MAF sensor. Could it be a vaccumnleak?
SOURCE: Jeep Hesitates. P0303 code
Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.
SOURCE: MAF Sensor and 02 Sensor
Replace the fuel pump with another one.
This is a common issue.
Don't use an "aftermarket" pump; buy one from Chevy.
I just had this exact same issue in my shop. The truck would run for a bit, and then just stop. I had the truck towed in, and the fuel pressure was good. Drove it for a while, with the gauge hooked up and taped to the windshield, I could see the fuel pressure start to drop off. I told the owner that she needed a new fuel pump.
The owner told me that the pump was 2 months old. I went ahead and changed it anyway. A new fuel pump cured the problem.
Testing the MAF and the O2s is not going to tell you anything. A failure, an open or a short would set the check engine light.
Please feel free to get back to me if you desire any further input. Thanks for choosing FixYa for assistance.
SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive
ou need to check compression on all the cly. do you know which cly is dead?
SOURCE: ENGINE MISFIRE AND SHAKING
check your wire harness on the top of the engine. Volvo must have bought harnesses from Mercedes. The insulation just cracks and disintegrates, then the wires short. Not good for an ignition system.Once they short It can fry the circuit for that cylinder in the computer. Does not set a code other than Misfire.
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