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It could be the Electronic Stability Control (ESC) is inappropriately kicking in. Another possibility is the throttle position sensor. In any case, have it checked out soon so you don't ending up stopping with traffic behind/across that isn't going to stop!
If the car is having trouble maintaining idle (the tach dips and car dies) the common causes are the idle control valve and camshaft position sensors. The cam sensors failing will be indicated by a check engine light.
The ICV can removed and cleaned with good results (I think there is a write up on bimmerfest) or purchased new for about $100.
While you are in there check the intake boot that is Y shaped for cracks, it's prone to fail and will mess up your idle too.
read up on the major forums and you'll get more info
A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.
If it doesn't di it again don't fret over it..you could have picked up a litlte water, or condensation from your fuel tank for that particualr moment...add some "HEET: to one tank of fuel but only once a year
Car dies when coming off acceleration or at idle in traffic or at a stop. I can watch the Tach go to 0 RPM, some times it will restart immediately other times it is hard to start, so far I have always been able to re-start it and Drive on. Does anybody have verified fix for this issue, I have seen posts saying can and crank sensor, throttle body, EGR, and many more ideas... Do not really want to just start replacing parts with the hope that I eventually get a fix. Help...
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