(to me) 96 Laramie Slt 2500 CTD 4x4 (145,000) across the country from california to WV. It has a banks exhaust, aftermarket lock up TC, K&N cold air intake, 285s, 4:10 rear. Holy cow what a fun truck! Got about 17 mpg at 70-75, better at 65.

Once in a while after fillups it seemed like I was getting a little bit of surge at highway speeds. I put some Power Service in and it went away. It was not a great deal of surge, maybe 50-75 rpms, but enough to notice. Next fillup it came back. I did not put in any PS this time and it went away on its own.

I know I have not provided much info, but is this fuel-quality related? Any ideas?

 

Fuel filter/water in fuel drain? Have you checked these?
Drain off the water in fuel valve, then change the filter.

 

Check the screen in the primary filter too.
The one by the starter below the primer button.

Oh yeah start saving your money now.
Seems like the modifications will never end.. yeeee haaaaa

SFB

 

so i can locate the stuff you mentioned, and it is going in for an oil change and will get the ff done then.