Ive got a 07 Avalanche LTZ with a stock 5.3L Vortec.
The engine has an extremely noticeable mis-fire when under light/heavy load. If you just drive up a steep hill at low speed. The vehicle kicks enough that you can clearly feel it. The engine seems to idle smooth and there are no dash lights or codes being thrown.
Delco plugs were installed just under a year ago but they have not been removed for inspection. Wires were replaced, problem remains. Wires appear to be properly connected.
I just dont understand how a code can not be thrown for this. This is really making me nuts. All help appreciated.
Thanks
Bill
The engine has an extremely noticeable mis-fire when under light/heavy load. If you just drive up a steep hill at low speed. The vehicle kicks enough that you can clearly feel it. The engine seems to idle smooth and there are no dash lights or codes being thrown.
Delco plugs were installed just under a year ago but they have not been removed for inspection. Wires were replaced, problem remains. Wires appear to be properly connected.
I just dont understand how a code can not be thrown for this. This is really making me nuts. All help appreciated.
Thanks
Bill