My girlfriend recently bought a used automatic 98 taurus with 90,000 miles on it, the car seemed great for about 4 months then it started having problems. I never really paid any attention to it however the car idled high as hell, it was idling 2 grand plus and would snap into gear when engaged. I didnt get around to looking at it ( i told her just make sure her foot was on the brake before putting the car in gear) then service engine soon light came on and of course the girlfriend was paranoid as could be she would be stranded. I had autozone check the trouble code and then i looked it up on the net and what do you know it said throttle position sensor , so i loosened the two bolts that hold it on and rotated it back some and the light went out and the car now idles around 800 rpm . Now i dont know if this is related to the above scenario however in the days to fallow the temp dropped pretty low outside and she started complaining to me that the car was jumping when it shifted. I took the car for a spin and sure enough it seems like its slipping when it shifts from first to second. When it shifts from first to second the car will jump from 2500 rpms to 3500 rpms and litterally act like it slams into gear before it engages. The weird thing is this only does this when its going from a dead stop for example if i do a rolling stop at a stop sign the car doesnt do this slam shift but if i come to a complete stop it does. Even weirder is the car doesnt do it when going up a steep incline ( when its under load ). If it was in fact a slip then it should slip under load not this intemitent crap. Does anyone have any ideas.