Sometimes my truck has no power, hardly can pull it self empty. Then all of a sudden, it will take off like nothing happen. There is no smoke of any color. Happens cold or operating temperature. Warm or cold day. Engine sound normal. It seams my mileage is dropping. It may run great for days then act up several times and then stop acting up.

2002 with 4 speed automatic.

 

Welcome to the site.
What's your lift pump fuel pressure?

 

No idea, I planning to take it to the dealer tomorrow. I hope I do not mess up anything by driving it to the dealer.

Thank you