1998 k2500 454 vortec starts hard win worm

Sounds as if your starter may be no good

starter is good it crank over vary good

Engine is getting vapor locked boiling gas out of carburetor You can get a special ceramic flange gasket to put under Carburetor to dissipate heat transfer to carb..

No carburetor on that one there POOCH, it has a throttle body. Anyway, is the check engine light on? If so have the vehicle scanned for trouble codes. Possibilities are the Ignition Control Module may be going bad, engine heat will affect them when they start to go bad. That can be tested at an auto parts store. Also possible leaking fuel injectors, you would have to do a fuel bleed down test to verify.

i pit a now ignition control module in still cranks 10 to 15 sec be for it starts win worm up

listen not a carburated eng. n not tbi 98 is vortec why youmess with people that need help. could fuel pressure regulator or timing issue.