First of all, put your X5 info into your signature so we always know which version we're dealing with.
Since you replace the coils, plugs and fuel filter, I assume that you have vacuum leak in bank one. How's the VCG?
P.S: I know we're dealing with an I6 from your thread info.

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)