Hello. I really need some help w/ this problem. my truck isn't running right. when you start it and let it idle, its a up and down idle and seems like it wants to stall but gets enough of whatever to power back up, when I drive it from a stop, its really shaky/jumpy. I put new plugs in it right befor this Halloween, last week I had a starter put into it and I told the mechanic that it wasn't running right and my 4 wheel drive isn't working. he said when I came to pick it up later that day that he fixed the idle/driving problem. yes he did, he said they hooked up a vacuum line that wasn't hooked up, could this vacuum line have fallen off again, does anyone have a clue of what vacuum line it sounds like? and for the 4wheel drive could that also be a vacuum line also? any help is appreciated! thanks TRAVIS!