after saving for months to buy a mini van to take my kids places I bought a 2000 windstar & have had nothing but problems. The latest problem is really worrying me. The front end has a shake to it...a lot of times at take off but at other times too. Tonight it started shaking & made 2 boom noises while it jerked & then was fine. Three times it has just shut off....2 while I was driving at about 40mph & the other while sitting at a stop sign. The mechanic I took it to can't find anything wrong & of course when he drove it it didn't shake at all. He checked it with some computer but said no codes came back (whatever that means) so he told me to "wait until it gets worse then bring it back". In the meantime I'm afraid I'll get hit while having my kids in the car with me. I know it's hard to know what could be causing this without looking at it but if anyone has any ideas I'd so appreciate it. I'm at my wits end with it. I had the serpentine belt replaced today because when the car would shake & cut off the belt would squeak & would also squeak in the mornings at start up but changing it didn't make any difference in the vibration or shut off. Thanks so much for any ideas.