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1991 964 cold start engine stall

Engine

Vehicle Information: Year: 1991; Body Type: Convertible; Engine (type, size, modifications): tiptronic 3.6; Total Mileage: 116,000;

I have never experienced a problem with the engine stalling from a cold start until after my recent tune-up which included valve adjustment and transmission service. Work was done at reputable independent shop. After starting the car in the morning or after it has sat all day, I let it run for a few minutes,then when I put it in reverse it stalls, but will start right back up, it will sometimes stall in drive as well. Took it to another shop, which we changed air-flow meters and adjusted the idle, but it is still doing the same thing. It is ok once it's warmed up, which takes a little while. Not sure whether or not it's going to stall when I enter traffic. What would you suggest?

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