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1988 944 Turbo S Mass flow meter door spring adjustment

Engine

Vehicle Information: Model(924/944/968): 951 S; Year: 1988; Body Type: Coupe; Total Mileage: 202,951;

I took my car to a shop to diagnose a subtle hesitation below 3500 rpm. Above that rpm the car seems to pull ok. After many different things they did which didn't resolve it, I unplugged the O2 sensor and the problem disappeared. One of the things they did was change the position of the toothed spring holder in the air box. They "loosened" the spring tension by moving it 2 teeth positions. Is this a tricky way of getting my car to run richer? The flapper will move more with less air. What are your thoughts? By the way, I haven't changed the O2 sensor yet because it's running pretty good with 22 mpg. Do you think I'd get even better gas mileage if I replace it?

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