Recently had truck worked on and truck seemed to lack some power, ran a little rough throws 27 code. Discovered they had 4 and 6 injector wiring swapped, fixed that, truck runs great, now after approx. 100 miles getting 27 code again, truck still running very well. Computer itself?
My personal suggestion would be to
go for these repair catalogs. I know this website www.reliable-store.com that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.
SOURCE: engine runs rough at idle and seems to miss
I don't think the computer, maybe the throttle position sensor, EGR valve, it could be a few different things but would put the computer at the end of the list. These will have to be checked for correct ohms and voltage to determine which isn't putting out the right ohms to work right.
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