Ser # OG569909 200 EFI Stalling sometimes

[Openfacereel]

Hello all, Serial # OG569909 1997 200HP EFI
Having a sporadic issue when trying to get on plane, sometimes it acts like its starving for fuel and will bog down but then finally catch and take off. Runs perfect once on pad.
I replaced the Fuel line and bulb with new gray line, also rebuilt pulse fuel pump with all new diaphragms.
Any thoughts on what could be the issue? I will add that it normally does not do this at first take off or maybe even the 2nd. seems like the hotter the engine is the more likely
it is to do it. Sometimes I can feather the throttle and it will catch and take on off but other times not.
Appreciate any feedback or thoughts

[JOE54]

do spark test when problem occurs on all 6 , may have a switch box going out , monitor timing under acceleration , fuel psi test will help also under load