octane and timing

["Gordie Bird" <mg_bird@yahoo.com>]

In a effort to cure the run on in my 1622cc MGA I put a tank of 110 octane
racing fuel in.  It cured the run on, but now I have trouble maintaining a
steady idle, sometimes even stalling when coming to a stop.  Prior to this
tank of gas I had a nice steady 800 - 900 rpm idle.
So, most learned listers, will altering the timing help this situation?
TIA

Safety Fast!
Gordie Bird
62 MGA
80 MGB
86 Audi 4kq

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