My 1992 300E has the 9 pin connector and the 16 pin connector. I cannot find an adaptor to plug into either socket to use a Baum XENTRY system. Is it possible to use a flash system to analyze my performance issues?

Poor acceleration comes and goes.
Cold start idle goes to 1000rpm and when in gear drops to 500 and rough idle. All is fine warmed up.
Now at times I get a "cough" back through the air meter when I accelerate from a stop. Not all the time.

OVR new, plugs new, rotor/cap new, ignition wires new.
Cleaned the AAV.

Any ideas and help appreciated.

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Handyjay