I have a 1986 Ford E150 Econoline van with a 5.0(302) and need help!

I am not sure how to word this but I go to start her and she runs kinda rough in ide. But she runs and I can rev it up too but the problem is more so with her in drive. She goes just a little and then sometimes acts like she wants to die. Turning corners, she wants to die, she takes off rough from stopping at signs and lights but when she gets to the other side of the street she wants to die. She wont let me go over 20-30 mph but she goes. lol... What can I do? I have replaced the fuel pump, the EGR valve, put a new air filter(KnN), I have replaced fuel injectors and I believe a map sensor. I think maybe a new fuel filter might help a lot. She has two tanks and the rear didn't work so I used it for back up and siphoned the gas out not knowing it was rusted before I replaced the fuel filter when it did it before. I checked all hoses and wires and nothing is amiss. I am a pretty decent mechanic but for some reason I just cant figure it out!
Asked Aug 03, 2014

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.