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Message: [QUOTE="Black 02, post: 1341983, member: 6916"] The truck acts up only when warm. Yes is smokes a little on startup, but it's been cold out here. The idle is pretty good when cold. It idles about the same with both tuners. It appears that the truck doesn't start missing until the water temperature is at operating temp and the oil temperature is above 185 degrees. That's when the hitching seems to start. Seems like it gets worse when the oil gets above 200 degrees. Using either tuner's tunes, the truck hitches the worst at about 1750 RPM and holding steady. That corresponds to about 1/4 throttle at most. Stand on the throttle and it typically takes off like a bat out of hell and smooth. Pulse width seems to be between 1.3 and 1.7. MFD seems to be between 13 and 18. Today, I data logged my drive to work again. I noticed that the graph shows the ICP moving up and down when the hitching occurs, but it's not as rapid as the hitching. Maybe the AE doesn't record that quickly either. Either way, the ICP is dancing around with a fairly pedal. The oil temperature was about 200 degrees here. [ATTACH=full]161811[/ATTACH] After I got on the freeway, I switched to G-head's tune. Within 30 seconds of doing this, the duty cycle started climbing until it got to 88% and then the ICP spiked from like 1200 psi to 3800 psi instantly. I know this isn't "ghost" data because the injectors hammered incredibly hard when the spike occurred. It was an extremely noticeable sound change when the clattering occurred. This doesn't happen on Swamp's tune. When this happened, the P1211 code threw (ICP +/- expected). This graph was while holding the pedal steady at about 2300 RPM on the freeway with OD off. [ATTACH=full]161812[/ATTACH] When I got to work, I let the truck idle for a little bit. It idles a lot rougher when warm then cold. I did 4 different CCT tests at this time. First time 5,6, and 8 failed. Second time, 1 and 8 failed. Third time 1, 2, 7, and 8 failed. Fourth time was just cylinder 8. When I'm driving on Swamp's trial tune holding steady at like 2300 RPM, the truck is fairly smooth. When I stand on it from there, the truck almost bogs down then accelerates slowly. The ICP doesn't climb above 2300 psi, but the duty cycle stays down under 20%. May just be the tune. I'm at a loss. I've changed every typical sensor I can think of. Now I'm down to.... Bad Injectors IDM Issue PCM Issue Bad Throttle Peadal Signal Engine Oil. I'm gonna change the oil and just put some Delo in it and try it. Otherwise, I'm losing my mind trying to diagnose this thing. I need to get Dave or Matt out here and live tune this damn thing! [/QUOTE]