The cause of "wet" spark plugs, ignition wiring, and engine stalling depends on what you mean by wet.
Your use of the terms wet AND stall suggest that you mean water on the outside of the plugs and on the spark plug wires.
If you are talking about external wetness with water, then the cause is usually one of two things:
In either case, the result is misfiring, rough running, and in the worst case scenario, even stalling.
IF on the other hand, by wet you mean liquid fouling of the spark plug terminals inside the engine, this is usually caused by one of two other things:
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Several things can cause your car to stall and shake when you stop. Replacing the spark plugs and spark plug wires may cure the problem.
Could be as simple as needing a tuneup with a new set of spark plugs.
Any number of things. Take the car and have it checked by a Tune-up shop.
If not gapped right your car might start shaking, or even stall or worse no star.
There are several things which could be causing the car to stall out while driving. The most common and least difficult problem is that the spark plugs may need to be changed.
Same as you normally would in any other car, depends on the spark plugs.
Lots of things. From misfiring spark plugs to incorrect timing to deposit build up.
it could be a ignition problem (spark plugs etc), when you turn the power steering pump will put a force onto the engine if the spark is weak it could cause your engine to stall
the back fire could be a sign that you need to get new spark plugs, posibly wires to could help and the stalling could be to do with the carb.
Try gaping the spark plugs. I had the same issue where it would stall when I was in gear and stopped unless I had my foot on the gas, then gaped the plugs and immediately the problem went away ~ Usually this is caused by a vacuum leak