Problem with Jeep Grand Cherokee 1999

Well, I have a Jeep Grand Cherokee 1999, it is the 4.7 V8 4x4, I have two problems with her one is that in climbs that are not so inclined or so long, approximately 10 km, it heats up until I get almost three quarters and that because accelerating in a normal way to mild, the other problem that you have is that when you take the curves to the left and go at a normal speed, not so considerable, it stops accelerating even Intermittently, stop accelerating two seconds accelerates two seconds and stop accelerating again and so on the curve. At the beginning I thought it was a system to avoid skidding or something in curves but only does it when one turns to the left, I do not know if they have some solutions or ideas of what may be