is it actually trying to stay in gear when you shift to neutral or is it shifting into neutral just fine? in other words...is it the clutch or the clutch pedal that isnt releasing? if its the pedal I suppose you can always check the spring...hate to say it and scare you, but 2nd gen DSMs did have crankwalk issues...all 7 bolt 4g63s I think, I cant remember the symptoms exactly, but I believe funky clutch engagement is one of them..