A buddy just phoned on his cell. His truck surges at highway speeds. 2004, automatic, it does it whenever it gets below freezing. Is there a vent or something freezing over. The fuel is good, he uses truck a lot so fuel is winter blend.

 

Exactly when does it surge, cruz on or just cruzing. Does surge only when cold, then thats the grid heaters cycleing on and off for 3 minutes.

 

I am going to try it myself tommorrow, he says it starts about 20 miles down the road with cruise on, just a slight slow down than back to normal.