25 sunsation w/ 454mpi cuts out under load replaced feul water seperator, plugs, cap, rotor, wires, coil, moduel in distributer, charging system working fine, all grounds are good, runs on hose fine but when getting on plane it misses and if running with trim down not to bad but trim up and misses, started all at once he pulled into my docks one day running perfect few hours later went to leave andf it was there.

Thanks For Any input.

Check fuel preasure, might be ok on hose load is alot different

check for plugged injector screens had the same prob on my 502 mpis

+1

Took words right out of mouth!!! That's about all that's left! Or just dirty or bad injector. If screens are good.

+2. P.s. check fuel psi under load for sure too!!!

Always good to check and rule out anti-siphon vave at the fuel tank....

For sure and checking fuel psi under load will do just that.

Thanks guys ill let you know what it was.