hey would a 4 guage streetwires power cable work good for a ground, i was thinking of redoing my grounds(tranny included) even one on the exhaust but it may be overkill, i actually have read a ground on the exhaust system helps for some reason? if you can get the CEL to flash then the problem can be found. i have a repair manual i can go through and see if it says anything about your prblem. there will be no CEL if the ECU is bad for sure though.