Engine shuttering after cranking. Won’t run over 35mph

DirtyDusty

New member
Jul 19, 2020
5
0
1
Louisiana
Been having an issue with my 05 lly. Cranks fine, then after a few moments it will start shuttering like it’s about to die. It does it off and in for a minute then clears up. I put a scanner on and watched the injector rates and they are all within range. This morning it done it, but when I started down the road, it lost power and wouldn’t run over 35 at WOT. Turned around and came back left the truck running and hooked the scanner by up. Injector 1,6,4, and 7 showed exactly -7.0 the other 4 showed exactly 15. I turned it off as cranked it back up and it was still idling rough. Turned off and let sit for 10 minutes or so and it cranked fine. Idle and throttle response where back to normal, along with balance rates. It will still miss on occasion. Balance rates are back to normal. Any ideas?
 

2004LB7

Well-known member
Dec 15, 2010
6,969
2,137
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Norcal
Check out the ice pick trick and carefully look over the harness near the alternator to see if you have any damaged or rubbed through wires
 

DirtyDusty

New member
Jul 19, 2020
5
0
1
Louisiana
I checked the harness real good and kept wiggling and twisting it while it’s running to see if I could get it to repeat. It’s running ok now, but don’t know when it will do it again. Would a bad connection on one injector make all balance rates peg out? Btw it throws no codes during this.
 

2004LB7

Well-known member
Dec 15, 2010
6,969
2,137
113
Norcal
Yes. Look into ice pick trick for your injector connectors. Well known issue. There are also replacement pigtails available