1995 tahoe backfires with headlights on
I have a 1995 tahoe 350 tbi with 280k miles. I just replaced
the coil, pickup coil, icm, cap, rotor, plugs wires and plugs.
And now it starts and runs fine until I turn my headlights on.
Then it stumbles and backfires but only when driving. it
won't do it at idle. Sometimes it will even stall out. I've
checked all my grounds that I could find and checked
alternator and everything seems to be in order. I've noticed
when I turn the head lights on my volt gauge on the dash
drops from 14 to 12 but alternator is still pushing 14. Now
I'm at a dead end so someone please help :(