Hey there I’m looking for some help I’m looking to getting into a g body it is a 1980 Malibu 305 all original a neighbor of mine is selling everything seems fine except the check engine light is on and i can’t figure it out. I would like to make sure everything is ok before buying it. I can’t find a diagnostic port under the dash like say a 81 and later model to jump the pin is there any way of pulling a code on a 1980? Thank you