When I pulled out the rear differential, drive shaft and short shafts out of my old 99 Honda RT-4WD CRV,
I found the cruise control started doing a P&G on it's on..
Without the engine being loaded down by the rear-wheel drive,
the CC was over-shooting the setting.
Then it would slow down back to the set speed.. Auto-P&G..
(It was 'chasing' the speed setting).
Then, I tuned up the cable tension a bit and got it running smoother.
But before that, it only ran smooth going uphill.. !
And once when I had it loaded up with 400 pounds of lawn much.
So, if you have an older CC with the old cable setup, maybe you can add
some slop in the line and get Auto-P&G..?.