A couple of problems with my 1994 Z28 LT1 187,000 miles.

Replaced plugs, water pump and optispark about 40000 miles ago.

Car will not start after a moderate rain, the engine sputters and coughs. I don't think anything under the hood is getting wet, I think it is more of the moisture in the air.

After the rain dries up the car starts fine. I have blown warm air on the coil and icm and the car will start fine.

The car then developed a bad miss, the coil was arcing to ground. I replaced the coil and still have same problem. When the car is missing you can see and hear a spark jump from the coil wire to ground. The car sometimes runs fine with no miss (not for very long though).

If I am driving or I turn the engine off and it is raining the car run will run fine or start just fine other than the miss.

Any suggestions....

I know I probabally need a new set of plug wires at least.....

 

Plug wires can do that to ya, and also don't forget that the coil wire gets 8 sparks for every one the other wires get so it wears out first and you should replace it more often.

 

Thanks I'll try new plug wires.

 

You can run the car at night and mist them with water and see if there's arcing.

 

Check for burnt plug wires for sure, I had that problem and thought my coil wire was bad and then thought my coil was bad, and it ended up being a spark plug wire had a burn mark on it. Also might wanna take the coil to auto zone or somewhere and they will check the coil for free!!!