I'm new here,my problem is if i stop at a light or something and start to go again it slips then bangs into 1 and the same into 2 but other gears are good. I took it to a shop and we drove it for 20min and it shifted great.So they changed the filter and fluid.When i picked it up of course slipped alittle into 1 once but shifted great the rest of the way.I guess i need to have it scanned? HELP