I've had this problem for 5yrs. When this was under warrenty,replaced resenator and hose's a couple of times. The dealership could't find a problem. If i'm going uphill or an encline the van goes into a limp moad or lose's power. Have to pull over, turn off engine.Something resets and i can turn back on and continue, untill i have to go thru the prosses all over.I've seen on line people having this problem,but never an answer to correct the problem.Captured code/po299 Can't find a code explaination for po299