Engine Died Now Won't Start

[njarmentrout1]

My truck died on me while I was at a stop light. It started right back up, and drove fine. When I pulled in the driveway and the rpm's went down it died again. Now it won't start at all. I have fuel. Not sure if I have spark yet (haven't been able to test yet). Any other suggestions? Truck is a 5.7 FI (throttle body on top with two injectors).
That being said. I'm not sure if I have an intake manifold gasket leak or not. I found some antifreeze on the top of the engine block by the manifold. I just changed the radiator too. It does seem to use a bit of antifreeze. Any chance the two could be connected? Never has overheated, and has always ran GREAT. As many suggestions as anyone could give me would be great. Thanks everyone.

[Pontiac1976]

Well timming or timimg chain jumped . Check the timing. how miles on the motor what yr is the motor. Is the fuel pump working is it got fuel pressure (5-7PSI ). Good luck