Regarding My Friends Truck

[Cw72gmc]

He has a 72 gmc as well. We took it through the car wash, we paid for basic. But the lady gave us supreme. It was 15 degrees outise and the truck wasnt quite up to operating temp. The under carriage wash sprayed the engine compartment. About 30 seconds later it died. After numerous attemps to start it.. With the pedal to the floor it would idle 500 rpm with major back firing and irratic firing pattern. Finally got it to idle right but give it any gas it would die.

After 15 mins of idling we drove it home 40 miles. Its running ok but is missing on the passenger side. It will pull out of it and do it again...almost like a weak plug starts firing.

My question is...Where do I start first? Plugs and wires? Did the motor firing like it was foul a plug...Or do you think water made it into the cap and there is just a lot of moisture there?

Please help...

[BB72CHEVKT]

Sounds like moisture in the cap.

[big_al_71]

I would pull the dist cap and make sure it is all dry in there, spray enough WD40 in there.
If that does not help I would check all the plg wires pull the boots and make sure they are dry as well.

[Sinister]

Originally Posted by bb72chevkt

sounds like moisture in the cap.

x2

[mrein3]

If it still has its factory point style ignition, I would also suspect the coil. If it is only missing on one cylinder I would suspect wires.

It sounds like your buddy would do himself a favor by doing a good old fashioned tune-up. And replace the ignition coil and wires. The old stuff can all go in one box that will easily slide into the bed for emergency road-side repairs.