I found this in the Monaco Owners Club forum: (Actually, it was the "irv2" question and answer forum, I guess.)
http://www.irv2.com/forums/f115/abs-and-atc-light-220446.html"Yup, Automatic Traction Control, ATC.
"The long story --- about 300 miles after taking on what ended up to be a bad tank of fuel in the Yukon, out of my peripheral vision I saw what I thought was my ATC light just blink on VERY briefly. Didn't give it another thought until many miles later it did it again. And then many miles later again and again and again. Then after some 700 or 800 miles when climbing a fairly steep grade I felt a slight hesitation along with the ATC light flickering on.
"Well to cut the story shorter, it got worse and worse and worse until I had finally had enough when it was so difficult to manage some the rolling hills in California on the 101 without having the engine buck and hesitate.
"If I manually downshifted to say 3rd gear it would go away but as soon as it up-shifted to a higher gear it would buck and hesitate plus the ATC light would come on at the same time.
"Finally at a rest stop for the night just outside of Paso Robles I Google the symptoms. Lo and behold another Monaco owner had gone through the same symptoms two years previous and their solution was to change the fuel filters. BTW, that night my Aqua-Hot stopped working too. So the next day I went to the local truck shop and had two new fuel filters installed along with a new Aqua-Hot fuel filter.
"Problem GONE. So now I always carry an extra set of fuel filters in case it ever happens again.
"You can have new filters installed one day and stop the next day to take on a tank of fuel which turns out to be bad and BINGO, new filters clogged and shot."
