Engine light on
85 GMC C1500 pick up truck. Rebuilt 305
engine. And transmission. Check engine
light comes on when on hywy speeds. What
can it be.
Read the OBD1 codes. Look up how on the net.
As you had a check engine light it has stored the code, so either have the code pulled by some one with a scanner that can do old GM OBD 1 or do it yourself using the paper clip and read the flash out code. More on how to do that is on you tube if you would like to watch a video.
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