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"Mathew, Jesudas A" <JAMathew@domain.elided>

This is a pure guess at the problem. 

There are two temp sensors on the block near the front next to the 
spark plug rack.  The have a blue head and a brown head.  (At least they 
are on my '88 528e)  The blue one is for cold start I think.  My car was 
having a hard time starting, which required many cranks. The Chilton 
manual has the proper resistance values, so grab a meter and check em 
out.  They are pretty cheap to replace.

Other things could be you have an air / vaccuum leak, allowing too much 
air in, such that when it warms up the hole get bigger. My old VW Jetta 
had that problem.  

Another is maybe dirty spark plugs.  Check those out.  They may be 
fouled or getting fouled.

Other than those guesses...I don't know.

Good luck

ds