Need some help dont know what else to try . I have a 87- 1/2 t 4x4 350 t b i 4 spd with electrical problems . When hot it will not start even after 5 minutes . I changed the starter , alternater, coil , battery , battery cables , took it to two reputable shops , even the dealer , and still had no know luck . They all said it ran fine . Can anyone please help ??. I have a 85 1/2 t 4x4 350 carbed auto , and a 86 gmc 3/4 t 383 carbed auto , and tried switching starters from both rigs ,and same problem , 87 is all stock , 86 & 85 both have header's , and have no problem's when hot .please need some help . thanx .