OK,

so now i put everything back where it should be, all the old wires, coils, connectors even the old OVP....

I have a noticeable roughness at idle, little bit of a light flicker, codes 9 & 4 on pin 8

attempting to reinstall the old voltage regulator also to eliminate possibilities......

any ideas? where are the experts?

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1993 300E, 2.8 M104 .....