5.7 misfire but no codes

[croaker567]

Ok had a short on the power wire got it fixed, its running but still surging. I don't know if this has anything to do with it but my lights dim and brighten in sequence with the surge.

 

[KGBIGCOUNTRY]

Check your alt to see if it spins freely or test it to see if the power is jumping.

 

[croaker567]

Would that have anything to do with the surge?

 

[RonJon '06]

If you have a volt meter you can test the output of the alternator to see if it's constant or if it's fluctuating. If it's surging then I think I would take a closer look at the throttle body but I would probably try and rule out anything electrical first. Bad battery, bad battery cable, bad ground. I would just take the volt meter and start hunting around.