THIS IS THE EXACT SAME PROBLEM I HAVE BEEN HAVING for the last couple of weeks and since I just had the tranny rebuilt a few months ago I took it back into the shop for the warranty service and we will see what they say..... I just dropped it off today, I will keep you updated, but this should not end up costing me anything since I bought their $400 4 year warranty on the tranny after the rebuild. Once again this sounds exactly like what I have been experiencing only from a stand still or when downshifting back into 1st, sometimes it goes from just "slipping" to "jerking" in and out of 1st when accelerating..... Weird.