87 Chevy Truck - Interior Electrical Noise Question

[tucsonjwt]

I have no idea what the problem is, but it reminds me of the static suppressors which were on my 1963 Corvette (and all 63-67 Corvettes). These were metal shields which were held against the block by the spark plugs and designed to suppress static radio interference. Just a thought - maybe you have a plug wire/spark plug issue? It is not likely, since you have a metal bodied truck, not a fiberglass bodied Vette.