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Message: [QUOTE="Fordcowboy, post: 208131, member: 312"] Haven't had a chance to do any testing yet, but thought of some things that I didn't hit on in the first post. Don't know if it changes anything or rules anything out, but figured I would add it anyhow. Truck starts up and idles normal, the issue comes after driving for a bit. When I said cold in the first post, I more so meant, after it has been sitting for 8+ hours. It only happens towards the beginning of the first start up after sitting. If I am running around town or on a longer drive, it doesn't re-occur. This morning it was 7* when I started the truck. Let it warm up 15 minutes, everything was normal. Drove halfway to work, right about 15 more minutes, with no issues. Then taking off from a stop light, as soon as I hit the throttle to take off, CEL came on and it started missing. Stayed on for about a minute, then went off. Stayed off for about 30 seconds, then back on, It did this for about 5 minutes total, and then everything was back to normal. I did notice that the CEL would come on while I was on the throttle, and then if I let off and started coasting CEL would go off shortly after, then hit the throttle again, CEL back on. So it is definitely related to putting a load on the motor. The reason I thought it might help narrow it down is because injectors and oil should have been warmed up by the time it happened this morning. Truck had been running for 30 minutes total, 15min idling, 5min through town a bit, and 10min on highway. Engine temp was up to normal. It would seem like this would rule out mechanical injector problems. I would think UVCH or loose wiring would occur more often or more randomly, not just a few minutes into the first drive after siting a while, and then not happen again. I don't know if a faulty IDM would have that much of a pattern to it or not? I am still going to do all the diagnostics mentioned above as soon as I can, and see what I can find out. [/QUOTE]