I need some help and please, I have a 91 f250 with a 351 4x4. I know how bad it sucks to not get a good description so hear it goes. So Ill go out to the truck to do my days work and start it up, cool, kinda runs like crap but it evens out, runnin good hit drive and you have to really be soft and smooth with the throttle or it will fall on its face, and that is all day long, every time i stop i have to finesse it. next problem which is just an add on to my first, sometimes it wont start right back up, you have to mash it to the floor and then it will start but you have to wait a sec to hit drive or it will die, Now if your going down the freeway you dont have to be that gentle just when your taking off or going real slow. I think thats all. TPS? I had a jeep that the TPS went bad and the only way to start it was to mash it and crank it. any help would be awesome