2001 Chevy Suburban problems?

shasha12341234

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starts and sounds great, goes about 20 yards in drive then starts to sputter and stall out. i can feather the throttle at about 1 grand and barely keep it running but if put back in neutral right away idles perfect. if sits idleing in neutral and warms up starts to stall too like it running out of fuel. then eventually dies out all the way and wont start untill cools down then starts perfect and idles perfect. i have replaced fuel pump, fuel filter, fuel pump relay, spark plugs, checked fuel pressure regulator and fuel pressure on fuel injector rails. pressure read good , it was between 45 and 50.
and check engine light has not came on
 
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