I had these same symptoms on my '90 245 one time. It was the AMM on it's way out. I pin-pointed it when I disconnected the AMM one time when it was doing this. No change in the way it was running. (Car barely ran and give it -any- gas at all and it would almost stall) I later learned the car was in
"limp-home" mode, and boy they ain't kidding!! I made the trip home at no more than 15-20 mph....didn't help the image of Volvo drivers' much!! The next morning it ran fine but I replaced the AMM and never had the problem again. One other thing: -NO- codes stored during all of this!
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