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Message: <blockquote data-quote="bmw4eva" data-source="post: 398184" data-attributes="member: 14423">Sounds like your airflow sensor is bad.Your engine hesitates because its either running too lean or too rich.On those old E30, you can adjust the flapper door tension inside the airflow sensor(located inside a black cover on the side of the airflow sensor).The tighter the spring, the leaner the mixture.To richen the mixture,losen the tension a bit.My old E32 had this problem before.Over time, the tension on the flapper door got lose and as a result,was burning too rich.It always stalled everytime i put it in Drive or Reverse.All I did was tighten the spring on the side of the airflow sensor to where to was tight enough and it cured the problem.It took an entire day for me to do this on my own, but definitely easy for a DIYer.</blockquote>