Help anyone! My ML has the exact same problem as dipinj. I changed the fuel filter/regulator and the three attached lines myself and the problem remains. Did you have the fuel pump changed also? $527 is around the price quote that I got for the work I performed, the pump would have raised this significantly. Also Magic, have your Crankshaft Position Sensor checked. I had the same problems in July of '06, cost was $454.56.