So I bought an '87 GW with Howell efi and a more modern style electronic ignition. The ignition system is like that of a late 80's to early 90's gm with no vacuum advance. The efi and ignition were installed over 20 years ago and I don't have any paperwork from the previous owner. It's time for a tune up. I need to replace plugs and wires. Does anyone have any suggestions?
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