my 96 f150 will start at sylenoid but not with ignition and key plus it is surging on power

Locate a wiring diagram to find out where the "big" wire by the distributor goes IF its original and not some add on, Have a voltage drop test done on the starer circuit it requires a multimeter this will locate the problem. scan the vehicle for codes too.

If it starts when u jump the solenoid then the distributor wire is not the original it was for something else maybe like a kill switch. U need to check wire going to starter solenoid, make sure a wire is connected to terminal labeled "S" at the solenoid that u bypassed to start it