So I have a 94 f150 with a 5.0. I bought this with problems and I have been fixing it up for about a year. Last summer all of a sudden while driving it it began to run rough. Wanting to die at idle and the idle was running high then low then high at a stoplight so I took it to the shop and they put a new throttle position sensor if I remember right. Then a few weeks later while driving it again the truck was bogging down and when I smashed on the gas it would hesitate for a second then take off like a rocket. I was told that it was the egr valve and that I could just unplug it. So I did and it ran fine for a whole year until today. It started to bog down again but the egr valve is still disconnected. It will run fine one min and bog down the next. I'm stumped. Any suggestions?

Thanks!