Type of factory paint on 1992 XJS

After a 7 year lay-up my '92 XJS V12 is finally running but the fuel mixture is extremely rich causing her to both miss & back-fire! Suggestions will be greatly appreciated!! Many thanx in advance! JagMan.

Welcome to the forums, can I suggest you use the pen icon on the header to more reflect the question you are asking in the body of the post?
Much more likely to garner some responses.

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Thanx. Robin.