My Syncro is doing the same thing and the mechanic = has not been able to fix it. We have replaced the AFM, idle control = valve and circuit, checked for vacuum leaks, and still the damn thing = "bucks"! I am eager to find out what the problem is and fix it! I was so = excited to buy this van and take it on my big 6 week camping adventure. Then = this problem developed, and I ended up taking my other van. I am back = from my trip now and have to sell one of my vans. I really want to keep = the syncro, but the other one runs so good. Please somebody out there = on the list help shed some light on this problem!