well after a drive to and from work today it did the same thing on the way home. I took off the cross over pipe and checked all the vacuum lines and linkages. everything looks fine,and I regreased them. It seems like the spring is getting worn out. I found a adjustment on one of the linkages and moved it 1/8 inch. put it all back together and drive fine. lets see what tomorrow brings. after this then I can fix the AC

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Trying to keep Jersey Fresh

1995 E300D 384,000,(Betty White) part time greaser, lots of new parts
2004 Ranger XLT
2000 Chocolate Lab-Bad Quarter Panel, lots of miles