I have a 96 gmc 1/2 ton pickup. I recently had to change distributor on engine. i pulled disrtibutor out and marked posistion of rotoe to relation of distributor and motor. I bought new distrbutor from local parts store and stabbed in just like old one came out. The truck will not start now and instead of asking someone i tried to reset timing. i know there has to be a way to set timing again!! Someone please help me i have been working on this same issue for almost 10 hours straight. all help is appreciated!!