Yes, much more info. I hope you didn't replace the rear main to cure an oil light issue... completely unrelated.
Your idle speed is probably dropping too low at idle, I would check that spec and adjust first.
Current ride... '13 GTI Wolfsburg
BMW's from my past...
'92 535i/5 '89 325ix/5
'98 750iL '86 325(e)/5
'95 740iL '84 318i/5