wats up guys!! i just finished re-tuning my truck to all the new mods i put and it feels badass!! BUT, there is only one problem...see since i got the truck, there was always a problem with high misfires on cylinder 5 and 8..i did all the tests to see wat was misfiring and still no answer, i changed spark plugs, wires, coils and still misfires..i'm thinking it could be my injectors...and here is the BIG PROBLEM, when i'm in the expressway, the misfires get worse and worse that it get to the point that it doesnt allow my torque converter (stock) to lock..it had always had that torque converter locking problem but didnt know wat it was until i pointed it out to my tuner and he told me thats wat it was....does anyone know what is causing the problem and where i could fix it???

 

get a voltmeter and check the wire connections that go to the coils. It could be the wiring. Just a suggestion.