9.5 stalling

[fritzeg]

My wife's 2006 9.5 keeps stalling while driving. Sometimes when she starts from a stop and gives it gas and sometimes on the freeway while she's cruising. Cold engine/warm engine, gas full/gas 1/4 full, there seems to be no consitency in the problem. Last time she pulled away from the curb and it stalled. It then wouldn't turn over for about 10 minutes and made (as she described) clunking noises when she tried to start. She has also complained of a lag in power when she steps on the gas. Of course the dealer can never "duplicate the problem" and the computer says nothing is wrong. Any ideas?