These are the exact symptoms of a car, 93 940, I was trying to buy. PO was told by 'long time Volvo mech' AMM, then idle air, then something else, and I was sure it was none of those but I wasn't sure what it actually Was. But before I could see the car he found someone who suggested fuel pump relay.
Voila, and so he decided to keep it.
Moral, check/replace fuel pump relay, get someone to read the codes, and stay away from the instrument cluster IMO.
Oh, edit, this was just on the 740 group. Coinkidink, I think not!
http://www.brickboard.com/RWD/volvo/1356681/740/760/780/volvo_740_stalling_problem_fixed_replacing_fuel_pump_relay_everything_else.html
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