Still having the same problem, the dealer closest to me only has one PSD tech and is at least a week behind, so it sits in the yard, waiting for a time spot and the $$ to do it, have check all the connections. Only does it at idle at a stop or while coasting down hill, another buddy mentioned the hpop pretty sure that one is pricey good luck please let me know what you find out and I will do the same. Snowman