Dont know if this applys,dont know if 86 uses a maf , My 93 300e would not idle and was a pain to start one day out of the blue the car would run and was drivable but had to shift to neutral at stoplights th keep the revs up,

scan code showed MAF mass airflow sensor , replaced it wasnt a cheap part but under $200

dont know if these just go bad like mine did , or deterioate slowly

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1985 190 2.3
1993 300e 2.8