P0300 GMC - cylinder missfire on rainy days and thru puddles

Question

po300, po301, po302, po305, only on rainy days or thru puddles clears up after about 1/2 mile of driving, new plugs, wires, I am a certified retired tech and I cannot duplicate the problem by wetting coils and wires with water in a spray bottle is there a weather pack connector I should look for and if so the location any info is greatly appreciated

Answer 1

The problem is most likely electrical, you can disconnect the ignition coils and fuel injector connectors may apply electrical grease