I recently purchased one of the well known controllers and I am having an issues with pulsing or jerky operation while I have my cruise control set at 70 mph. I talked to another person with a different manufactures box and he has the same issue. It does go away if I back the box way back. Is this happening with all boxes? I would like to find one that maintains a steady performance. Please let me know who and who is not having the same issues.

 

I have same problem after I bomb my truck seems 03's are only one with it and I believe there is a TSB on it. Do a search there are other posts on this.
Mines not super bad but does it

 

I have not had the problem on my 04.5 600 with any of the 5 different performance boxes I have tried. I have used cruise with them all and on most of the higher settings at various times.

 

It is normal to do this, my TST does it on anything above level 5. they do it because the cruise is designed with the factory power and the boxes increase the power. the cruise gives throttle like it had stock power(too much with the box) and it overshoots the speed it is going for so it cuts throttle to slow down and drops below again. and the cycle repeats. My TST is BAD on the higher levels on hills because it give too much throttle and goes into the TST's fueling parameters (100% above stock @ 8 psi on L9) and overshoots the speed

 

My stock 03 has had a slight pulsing with the cruise on from day one. I do mean slight, but it is there.