Stalls anywhere any speed, coasting, accelerating, stopped etc. Wait to restart.

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Car stalls, all dash lights come on at any speed or stopped. Mechanic stumped. I found MAF possibility on yr site. Must wait to restart, sometimes longer or shorter time. No code available. Increasing frequency of stalls to four per short trip recently. The MAF possibility seems pertinent since we live on a two mile long dirt road, lots of dust. Unrelated problem? Turbo smokes when idling too long.