problem with 92 pickup; KA24E engine. For months truck has run fine; 2-3 mos. ago truck wouldn't start (after driving it night before). Husband came home & it started for him. Yesterday the truck wouldn't start; removed blue "boxes" & replaced w/new ones. Still won't start; checked for corrosion on wires from battery to body; checked starter but not sure if bad/good; tried to start it - no luck. Came back inside & after few minutes went outside & it started right up; started it 2 more times after that; then tried to start it a third time - NOTHING! Any suggestions?