My 1990 over the past few weeks runs noticably rougher on an incline with the nose of the truck higher then the rear, and some times will stall if I hit the brakes hard while on the incline. I have also noticed that the gas milege is down a bit also..only mods are a ground fuel pin and 10 click on starwheel and BHAF. Any thoughts??
Nick

 

Look for a leaky fuel line between the tank and the lift pump.

 

Will, do I dont think that I have a leak but i will check into it, what about a failing lift pump??

 

It's possible, but an air leak is more likely.