Chevrolet: 92 chev, throttle position sensor, injector problems

Question
I have a 1500 4+4 with 151000 miles 5.7L with tbi.It starts fine when cold but if it's ran for a wile and up to operating temp and then shut off and left to sit for an hour its had to start.If I push on the peddal wile cranking I can get it started but I have to crank it quite a bit.Any help would be great. Thanks for your time  Donn

Answer
Donn,
     there are a couple things you can check... pull the injectors and have them bench tested. A parts store like NAPA or something should be able to do that, most of the time for free. If that checked out okay, I would check the timing. I have a '96 that the distributor got turned a little somehow and did something a little like that. You might also check the throttle position sensor. My brother's 94 had injector problems a while back, and it was hard to start when warm as well, now that I think on it. Anyway, check out those two things first, and if that doesn't help, I'll see if I can't dig a little deeper.