andrewwynn, thanx for the input but this is the infamos n62. i cant find a vaccume leak. now so bad even if i unplug valvetronics solenoids it goes into engine failsafe. runs so bad but very cold here. 6°F this morn. only 23° F this afternoon. not good. i cant seem to find the answer. it is on 26miles till empty. still runs but runs horrrible, i can shut off and then half throttle it. it will climb to 3-4k rpm and run. but eventually drops in rpm to a sugeimg pulsing idle and failsafe.

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01Evolve M5 86k silver over black, 02 M5 indi, Dinan, white over caramel 106k. 1991 850i with 66k ttint 72 TA # matching 455HO, with a few tweaks, 06 CCSB 2500 Duramax LBZ with 120 hp efilive tune, 03 CCDRW,LB7 with a 120hp efi live tune 140k. 99 FLHT. 03 FXDWG with 103 in it. 1981 yamaha 850 3cyl. Piped and carbed, cafe in progress. 1997 26' Eliminator eagle, 548 cid BBC built by me. 93mph. Lastly the reason why i am here, 05 x5 4.4. Purchased for pocket change and trailered home.