Have a 96 Voyager with the 3.0 V6 . When it gets cold you go to start the van it starts up ok then the idle starts going really high and won't come back down . If you shift into drive and try to drive it the van surges and bucks and generally doesn't run worth a you know what . Initially I thought IAC but I don't think that would make it buck severely like it is doing . This has been a problem the last couple of winters but not as bad . The thing is it almost completely goes away when it gets warmer out . It's not throwing any codes , 12,55 only . Once it gets warmed up completly it doesn't run too bad . Plugs have maybe 20000 miles on them , wires may be 45-50K . Nobody can seem to pin this down . I'm just trying to get this thru till the better weather gets here and then I am going to start looking for a new vehicle but this problem was really bad this morning , it was really cold last night here like 15 degrees . Any ideas ?

 

MAP sensors used to cause a similar condition. Might check that. Codes 12 and 55 are normal. MAP could be an issue but still operating within parameters and not setting the code.