1994 SSE, 164,000 miles, new plug wires a couple hundred miles ago (not GM, Autolite Professional). Anyway, engine started misfiring today. I can see a "glow" arround the front 3 spark plugs, where they screw into the head, whitish/blue arching glow that increases with RPM. At 4500 RPM engine starts pulsating up and down between 4000 and 4500 RPM like suddenly spark only half the time. No loose connections or moisture in or arround ICM or coils. Can anyone tell me what would cause this "glow" at the plugs? Note: using GM dual tip platinum plugs changed at same time as wires.

Check your plug gap at the least, Get rid of the platinum for sure.

Glowing means thay are getting "red" hot

check coils for resistance and ignition module if im not mistaken autozone does it for free

I'd think it was more likely the plug gapping like Dame said. But it'* worth a shot. Go to Napa and holler til they do it if your in the IL area.

lol

I hope he isn't in IL...you guys are too good at killing motors.

Thanks guys.
Plugs are fine as far as deposits, gap (clean/look good) It seems "funny" that all three odd cylinders are arching to the block and all happened at the same time. Will have the coils checked or check myself if I can find instructions and specifications.

My wife was driving the car (I know, that was my first mistake) she said she drove through some deep water. The engine is dry from heat and time. Coils and ICM are dry.
Don't know if just coincidence or if water shorted something.

Check it at night in the dark. I'd suggest changing the plugs as well, and checking resistance of the wires.