i found a vac line disconnected a week ago. It runs into the rear valve cover. I had to get to it by rocking the engine forward like our 3.8's. When i took the bolts out to do so the engine rocked backwards pretty far, but i didn't think anything of it. I got the vac line back where it needed to go and teh van seemed to run better. a couple of days later my wife said that it was running very rough so I took it for a spin. It sounds like there is a lot of stress on the motor or trans when I press on the gas especially going up hills. It hasn't lost any power though. last night i disconnected the vac line to see if it helped any and it did not and now it seems that the van is running rougher every day. i didn't run to rough at idle or coasting, but this morning is started running rough at idle. there are a few things wron with it that i know of, but i am stumped on this one. i was looking at her engine run compared to my 3.8 running and everything seemed ok.