Bridging the SCS connector sets the ignition map to base setting. So depending on how your engine was running it can be a fair bit different.
So definately this can cause issues.
You say when you checked it was wrong. Mmmm was it really, or have you now change it to wrong.
Strobe light definatly on No1 plug lead???
Aligning pointer with correct mark?? Red Mark.
Or using an adjustable light with setting 20 degree using the 'T' mark.
How was the engine performing before??? why did you think it needed adjusting??
Steve M
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Its all gone Norfolk!!!
Now in the Lotus position.