New here but not really I've read as a guest for quite sometime just never joined. I own 2 Duramaxes, my son owns the 03 & now he has a problem. He tells me it started as rough idle a couple months ago so he changed plugs & wires. Friday night he limped it home as it would not go any faster then 20mph. I drove it yesterday & it was flashing the mil & just wouldn't go. Checked the wiring seems ok, checked for vacuum leak around intake, changed Fuel filter & cleaned MAF & new air filter.
Logged it with EFI Live and 1,3,5 & 7 are misfiring. I'm lost & now he's got my truck. He says he's taking it to the dealer Monday but I was wondering if anybody has any ideas.
Thanks in Advance