Originally Posted by ISlapFatKids
I would assume it's the fuel filter, too. I had an old Blazer I picked up for less than $500 with the same issue (even at the same speed). All she needed was a new filter (for a while).
And as pelontks stated, the fuel pump would be my next guess, aswell. Learned about that thanks to that crappy old Blazer, too.
Last thing I know about would be to re-tune your carburetor, but that can be a PITA your first time or two, especially depending on what carb you have.
haha. I learned on my 84 chevy 3/4 2wd that I got for 250
When doing the fuel line check, I usually blow some air down the line into the tank to clean out the sock on the end of the pickup. Of course, I usually end up dropping the tank and never fix the blown-out sock. I'm sure it's not the best to do, but I haven't had a problem yet