Hi i`m new to the forum. Not new to BMW

Currently running a 316i Auto. Smallest and weakest BM i`ve ever had. I was hoping you guys could help me with a problem.
On start up the car will not rev above 2000ish rpm untill i`ve driven about half a mile. Then it suddenly seems to pull ok.
Fuel is my first thought, oh, the emissions light is on. Might be a link.
Any ideas ?

Come on guys help me out. I posted a few weeks ago about a loss of power issue. No other posts i have found seem to relate. 2001 316i 1895cc. Car starts and idles ok. If i let the car idle for 10 mins then set off, all is good. If i set off straight away the car has no power, and will not rev above approx 2000 revs. If i splutter along for half a mile or so, it will clear and run ok. Emissions light is on, pipes under the bonnet appear to be in good nick. Engine note deepens 5 to 10 seconds after starting. I know this is the baby of the gang, i expected good economy, not so, 25mpg.... could have bought a more stimulating motor if the mpg didn`t matter. Your thoughts please!

Welcome