I don't know what is wrong with your car,but here is what
the codes are.
51, coolant temperature sensor circuit open.
Do you have it full of anti freeze,the wires all hooked up,
cap and wires on the overflow tank.
66, Mass air flow sensor circuit out of range,low.
You could make sure the small wires are clean in the MAF.
99,Oxygen sensor indicates system lean,left side.
How old are both the o2 sensors,maybe they need to be replaced.
If you could list more about your problems.Maybe someone that
knows more about SCs,than I do would respond.
I would replace both 02 sensors,if they are old.
good luck RANDY