need help here please

[zlatko]

i have 92 silverado i need check for codes,i have 12 pin conector how do i do this?i dont no where to conect wire thanks zack

[Whifflebat]

http://www.fullsizechevy.com/forums/showthread.php?t=31857

[zlatko]

thanks i just did test i dont have any codes my light give me code 12 over and over i do have custom chip in truck from tbi chips no codes good?? or i am doing something wrong here ?

[NEUMANNZZ]

no codes are good. code 12 is diagnostic circuit working properly. any problems wih the truck?

[zlatko]

well i got one problem my idle goes up and down i think its vacum