Was wondering if I could get some advice on a problem I'm having. I Googled but I'm just wondering if maybe it's something funny with these trucks that I'm not familiar with.
It starts perfectly and will idle infinitely. Up to a point it drives fine and then it shuts off. If you lay off the gas or go to neutral it'll keep running. Shut it off and let it rest for any amount of time and you might get another 10 miles or you may get 50 feet. I replaced the fuel pump, gas tank, did a tune up, changed the fuel filter, and changed all the vacuum lines. When I changed the vacuum lines the problem went away for probably 50 miles. Timing has been checked. Any advice is appreciated and thanks so much in advance.