hey Cajun, I was trying to solve a problemwith my 1997 Dodge truck .. I found a thread that discussed the problem I had with my air vents changeing when I accelerated .. I changed the check valve coming off the manifold and it fixed the problem .. I also have a problem that could be related .. not getting good heat until the truck is at higher rpms. going to have to look into that and see what fix is suggested for that problem.