Any idea where the Mass Air Sensor is located ? Is it the wired device plugging into the hose coming out of the air filter box ?
Would it be beneficial for me to fiddle with this or possibly unplug it and attempt to drive the car ?

The car is eventually going into the shop next week, I would not mind doing some diagnosis this weekend and playing around with it.

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1998 C230
1994 Infiniti J30T
1984 BMW 318i
1987 VW Golf GT
1975 Buick LeSabre Conv.