Just thought i'd let everyone know what the answer was to my problem. After putting a new fuel filter on today with absolutely no change in starting, and still having poor running, I decided to 'tweak' the mixture screw. It was indeed running way too lean, I turned it just under one turn clockwise and now its excellent! Starts fine, idles great, and now I have power that I forgot I had before.

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i