ok thats a problem that make me pissed off
the car always run great when theres sun outside and when there's rain on the highway or residential road at 120 or 50 km/h it start to randomly go like if the fire is jumping maybe my distributor take humidity ?? or my car don't like it when i take it out in the rain haha
any idea
the stock caps contacts corrode easy, especially if the gasket on the bottom is shot which there known for
Spark plug wires. With it idling throw a gallon bucket of water on the motor. If it misses or dies it needs spark plug wires.
i wouldnt recommend just dumping a bucket of water on your engine, u can see spark jump in the dark and with a sray bottle if your having trouble
Dumping water on it isn't going to hurt it. Have you ever driven your car on the freeway in the rain? Everything under the hood gets completely soaked. You can pressure wash a running VG (or any other engine) all day and it won't hurt anything, though if the spark plug wells fill up with water it may miss even with decent plug wires. That's why I suggest a bucket of water rather than a hose. VG spark plug wells don't drain very fast stock so I "ported" the ones on the VG34 in my Pathy wheeler as it runs with the engine completely submerged on a regular basis.
thats all good answer guys but i already change my cap rotor spark plug and spark plug wire + fuel filter
i was thinking about the cap gasket can i use gasket maker?
Post Merge
Only when it rain or when it's damp aswell?
Since you seem to have done all the ignition side.. I'll just throw two more guess(although anything between dizzy/spark plug is usually the issue for misfiring):
weak ignition coil
air filter is letting some water in (like a CAI).
Usually just getting the plug wires wet any significant amount with plain water will make the spark jump to ground. You wouldn't really care where, if they're able to jump when wet they need to be replaced. Damned near every vehicle with a "runs like crap when it rains" problem is fixed with new plug wires... but you've already changed yours. I would NOT put salt water on anything I care about except my boat!
You cannot use regular silicone to seal the distributor cap on. It's not sensor safe and the fumes it gives off will destroy the CAS in the base of the distributor. (Don't ask me how I know this.) The vast majority of older cars do not have a distributor cap gasket or seal and they have no issues running in the rain so I really doubt that's your problem.
Did you change all the ignition stuff after this problem started and did the symptoms change at all with the new parts? Are they good quality parts or Chinese junk? Are your spark plug wires in the factory plastic insulator clips? Double check to be sure all the wires are fully seated on the plugs and into the cap. Also check to be sure the center contact in the distributor cap sticks down far enough that it's making proper contact with the rotor. I could see having a too-wide spark plug gap and new crap plug wires like Autolite together causing a cross-fire or short to ground when things get wet. Look closely at the ignition coil and see if there are carbon tracks where sparks have been jumping through the coil wire boot to one of the smaller terminals.
Double check your rotor, I have had two with tiny cracks that caused intermittent shorting