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I'd like to share that my 850 problems of running rich, stalling in the summer and also giving some lean codes is probably related to the air hose between the air filter box and the intake manifold. There might have been little holes in it that i didn't notice for years but I couldn't help but notice huge cracks in it this month. The MAP , mass air flow or whatever sensor is before this hose in the intake chain so it possibly got to the point where there was no air passing through the sensor or air cleaner. I wasn't driving the car much which is good if there is no air filtration.
I got a new air hose, seems to be much better. The check engine light has stayed off. The is pre- ODBC so diagnosis was limited.
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