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Message: [QUOTE="Big Bore, post: 156691, member: 760"] You can start the engine and let it idle for hours and it may never reach operating temp, especially at the sensor which is the HPO reservoir. Once you begin driving it starts running the warmer oil from the crankcase through the HPO system faster and warms those o-rings that are won and causing the "misfire". I had this exact same problem with a set of injectors that had 30K on them. Pulled em, confirmed bad o-rings, replaced, truck fired up all winter long without being plugged in. IPR o-rings could also be an issue, but not likely to cause the other symptoms like the "misfire". Another thing to check is stick EBPV. But I'm going with injector o-rings being the main culprit. If you can identify the injector having issues, pull it and check, pretty simple task. [/QUOTE]

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