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Message: [QUOTE="DHFF, post: 1065081, member: 7352"] Truck has ran pretty decent until recently I've noticed the truck has a stumble when its idling and also when its under load. Its not all the time nor is it throwing a code. I have an Insight CTS on it and am monitoring IPR, ICP, and the rest of the essentials other than fuel pressure which I will soon. I can't find anything out of the ordinary watching the 10 gauge monitor. It just started this in the last week or so and appears to be getting slightly worse. Question is, am I able to diagnose something like a miss or an injector without putting the truck on a professional tester? I use the truck literally everyday and have a hard time getting it scheduled into a shop to diagnose because no one will do it same day. I run power service treatment every tank and other than that the mods are in the sig. It runs really good other than the stumble/miss. Any ideas? I understand there are many things that are unanswered but just looking at things I may be able to check out in the hotel parking lot, as I am familiar with the engine bay.... Thanks in advance! [/QUOTE]

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