I took out my computer in my 88 TBI firebird and there are two little boxes with circuits in them and I was wondering what they do one is black and has Ac written on the outside and has 25075044 on it the other is yellow with AC sparkplug written on it Pn 25071437. anybody out there have a clue??????

 

these are Fartory sample boxes, the yellow i know is for the Defroster grid on the window, the black i believe is for spark in the engine, but im not totally sure on the black one