Hmm. All i can think is the linkage adjustment. Does it roll only backwards by any chance? Then it could be still in reverse. You probably thought of this. I'm assuming it starts right up when it park so it is not thinking it is in reverse?

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius