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Old July 8th, 2013, 07:42 AM   #1
beaterk5
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Default Misfire/ hesitation/ stumble

96 grand with the 5.2l I'm assuming it was severely neglected. I installed a new oil pump and pickup tube it fixed my knock from no oil pressure. But it throws random misfire code, idles really rough, an stumbles bucks backfires then try's to stall. Cap rotor plugs and wires look fine. Are there any common problems with these?
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Old July 8th, 2013, 09:03 AM   #2
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FWIW when my upstream o2 sensor shit the bed it started acting like that, this was on a 98 4.0
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Old July 9th, 2013, 09:32 PM   #3
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Looked into it more, fuel pressure is 45psi, and up stream o2 is toggleing as it should.
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Old July 10th, 2013, 10:07 AM   #4
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Leakdown and compression test, do it.
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Old July 15th, 2013, 02:58 AM   #5
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Had low comp cyl 2 but not to low. Leak down was through the crank case. Changed the plugs went one range hotter and it went away. After that threw it a cap and rotor and it ran like new.
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