I have a 98 F150. The motor was replaced three months ago and have had no problems until now. The truck had trouble starting so i put an alternator on it. Fixed for a while and then it started blowing fuel relay fuses. I replaced fuel pump and filter. Truck has trouble starting after sitting overnight. When I am driving and floor it, once it hits about 4,000 rpms, the truck bucks like its the transmission but the rpms drop and then pick back up. Does anyone have any ideas? Fuel pressure is right where its supposed to be.

 

Don't take this wrong please.
Your generating a lot of smoke and little fire to go on.
What was the fuel pressure?
Do you still have fuel pressure when there is a no start?
Does the CEL ever come on?
Are there any codes stored?
Do you hear the pump at key on for a second or two when there is a no start?
I'm looking for something to run with.
Good luck.