truck cranks, has fuel and spark, It did not get started for about a week then today i started it up and it ran fine for about five minutes then I was driving and it just died. Any ideas. Im going to put a timing light on it and see if the chain hasn't sliped. Its a 350 tbi with 165,000 miles on it

 

I would almost bet it's your ignition module. My 93 truck was suffering from the same problem last year. It would run great then all of a sudden quit. Sometimes it would run and sometimes it wouldn't. Fuel pressure checked out and so did the spark. The module would get hot and shut down on the injector side of the signal. It was very frustrating to figure out.