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I'm trying to help a friend out that has an 07 5.9 that is throwing a p2146 code. The cel came on while driving and truck started running crappy. He had it towed and looked at. They told him it had a bad injector but they didn't know which one and it would be $4000 to replace all of them. He...

The other day my truck started having a fast lopy idle and sometimes it misses. It doesn't do It all the time and if I shut truck off for a few minutes, when I start it back up it runs fine. My truck has a quadzilla with the high idle tune on it and when the rpms start to rise the truck shuts...