My ca has run very good with no problems ever since I've owned it. About 6 years. This year so far I've raked roughly 30 acres of hay in third gear, 3/4 to full throttle, pulling a new holland 55 rake. The last time I was on my way home driving on the road in 4th gear 3/4 throttle it hiccups 3 times when coming up a pretty steep hill. Nothing drastic just kinda long and steep. The governor kept the engine purring right along, no worries other than the hiccups. Then today I raked about 8 acres rolling hills no problems. Then I moved to another 2 acre field with a tiny knob of a hill and it did the hiccup thing a half a dozen times and the engine even stalled out on me 3 times. Question, what the heck is going on. Thanks.