Got to love the early cars and the fun stuff they do. I would attack the coolant temp sensor first as that seems to be a hard code that doesn't go away and makes the car run bad..it comes out or never goes into closed loop and when your choke and idle kick down it runs fat..my guess is it never gets into closed loop..I have heard of people replacing the coolant sensor with a two wire style..give Larry a call at vette specialties he has them from what I remember..the O2 will need addessed also because it is being overwritten by the coolant sensor..do this after the coolant and recheck to see if it still gives you the code 13 again..It's not worth removing all the computer stuff.. at least I don't think it is...it really doesn't do all that much...
Make sure you have coolant in the car also as the sensor will not work if it is really low.Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"