I have a 02 Durango with a 4.7 2wheel drive it's always had a high stall speed until you drive a few minutes ,than it would be fine the other day the tranny line going to my after market cooler blew off and stoped moving i fixed the line and refilled with proper fluid and amount.now it's seems worst it does move till 2000 rpm's but once it warms up its fine.My friend has a 2000Dakota and says his does the same but not as bad as mine is doing now. Had anyone had this problem and how to fix it