Arc from plug/boot on cylinder #5

[CorvetteBeretta]

I'm getting an arc from plug/boot to exhaust manifold gasket shield on plug #5 I cant tell if its coming off the boot or the plug itself. The car has been sitting for 3 years so I'm thinking the plugs might be shot and its not constant it happens on and off. I checked the plug wire it seems to be ok anybody have any suggestions...

[1988GTU]

What does the plug body look like? Picture?

Either the wire and or plug is bad.

[ronaconda]

Swap the wire with the #3 cylinder and see if the arc moves to that cylinder's spark plug. If it moves, bad wire. If not, bad plug.

[CorvetteBeretta]

Thanks all for your help Im going to install new plugs and test the wires tomorrow

[Money pit Beretta]

Check Rock Auto if you need wires. For my year they had clearance sets for ultra cheap! Like less than half price. They may have some for your car too.

[CorvetteBeretta]

So I changed my plugs ( used e3's) when I pulled the wires off the coil pack (closest to the trans) I think it fires #5 and #3, both contacts were rusted even the insides of the boot were rusted. So it looks like I need a new coil pack and plug wires, I'm also going to change the ICM since I have never changed it. I cleaned it as best I could considering all my tools are at my shop and its still arcing I'm not surprised.... I will get some pics up

[3X00-Modified]

If it's still arcing the the wires are crap.. just replace the wires.

[Money pit Beretta]

Someone is not using dielectic grease..........

Plugs should be AC or NGK, others will cause problems. Just FYI.