Turn right, runs fine. Turn left, uh oh...
 

I have a '00 F150 XL Sport with 4.2 V6 / 5 sp. When I bought it, I was told it needs intake gaskets. When I cranked it up, it smoked like a freight train and needed help idling. I drove it home and noticed that when i made a right turn, the smoking would briefly stop and she ran great! Then, it would get bad again. Any ideas?