88 Ford Ranger, Strange things happening
 

I have a 88 Ford Ranger 2.9 that is acting really strange. I will be driving along and all of a sudden it starts to bog down and shake, spit and sputter. It also starts smoking a little. Here is the strange part, If I turn the key off and on real quick it starts running fine again for about a quarter of a mile and then it starts doing the same thing again. Something else is that some days it runs fine and other days it does not. Turning a corner really sharp or right after adding fuel also seems to cause it to happen.
Things I have done:
Replaced the fuel pump
Cleaned out the gas tank
Changed out the fuel regulator
New distributor and rotor
And one of the relays I think it was the fuel relay