95 454 mag mfi seems to run ok at a idle but misses when under a load no codes set fueil pressure runs between 35-40 has new dist cap/rotor /plugs/plug wires/dist module /coil .ran fine at lake but when i slowed down to turn around it would not plane out then would not get above 2200rpms help

Sounds like water in your gas. Pour out your separator in a glass and see if it has water in it.

check and make sure they got the plug wires back in the right spot and that there are no broken plugs. did this before, took me a while to figure out i screwed up. and i still have a hard time accepting that.