I have a 2000 Dodge Durango. ten days ago it stalled while driving, I spent 500 dollars to get the problem diagnosed and fixed, supposedly it was the camshaft sensor and the crankshaft position sensor. now I was driving it today and it never actually stalled but it wouldn't go over 30-40 mph. When I tried to give it gas to speed up it would just jerk violently and my speed stayed the same. I came to a complete stop a few times at stop lights and it accelerated very slow back up to 30 or so and then would refuse to go any faster. Any idea's what might be wrong with my car this time?