How to tell if timin jumped in a 95 Chevy truck?

Take the air cleaner off and push the gas pedal all the way down and hold it. You will need another person. Then have them crank the engine over and you be looking at the top of the 2 injectors and see if it is blowing fuel / mist up and out of the throttle body when engine is turning over. If it is blowing out instead of sucking then the timing chain has jumped time. It should ALWAYS suck in and NEVER blow out.