89 silverado check engine light

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Joined
Oct 20, 2014
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Hello all , I am new to the forum. I recently got a 1989 silverado 1500 EFI (GM350 with 4x4) out of a trade. So far i have changed the oil , oil filter , air filter , serpentine belt , battery , and starter ( all done literally 2 days ago ).

The check/service engine light was on when i got it , and i fixed the problems that were known , and its still on. I plan on changing the plugs/wires/dist.cap/rotor pretty soon.

How am i supposed to check the check engine light to figure out what needs fixed? Thank you - Josh
 
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