1994 GMC Sonoma?

Question

My truck has been tuned up and normally runs good. It is kept on the driveway of my home and not in the garage. Ocaisionally when it rains and i get in to drive, it idles rough and sometimes stalls. During dry weather it runs great. Anyone have any ideas what the problem could be? Serious replies please.

Answer 1

I used to have this same problem with my old 1978 Firebird. It turned out that some moisture from the rain was getting under my distributor cap and into the boots for my wires causing arcing and corrosion. I would check your cap, rotor, wires and plugs, and see if their all looking ok, or if you have a 4 cyl, check the coils, wires and plugs.