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Message: [QUOTE="oldbluef250, post: 115823, member: 493"] I have put about 100 miles on since I put a different motor in my truck. It seemed to run good at first, but now it misses on one of the cylinders when its cold, and it smokes blue. Once its warmed up, it will miss on two cylinders. I did a koer cylinder contribution test, and it said #1 and #3 cylinders are misfiring. I replaced the solenoids on those two injectors, the uvch, the wiring harness on top of the motor, and the idm. After all of that, it still runs like ####. The injectors were gone through by casserly before I put them in and new orings were installed. Mods in sig. Could and icp or ipr sensor cause this? Suggestions? [/QUOTE]

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