Ok I'll try a map sensor and see what happens. The cap and wires were replaced long before this problem started and fuel filter and gas lines rubber and steel were replaced. One of the gas tank straps broke in Oct so I gave the old girl an overhaul while it was in a buddies garage before winter set in. When it first acted up at Christmas I blamed water in gas, changed fuel filter again, put deicer in and topped up with premium fuel, nothing helped, then winter set in and truck sat. Now spring is here and I can get a chance to work on it.