If the lines are good and not leaking at any connections, and the bag is good, already replaced... it could possibly be the valve block/solenoids not seating properly and letting air past. The valve block is in the hump with the air pump, worth checking.

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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X5 pics

RIP 4.6is.....

2003 4.6is