Pcm
Knock Sensor is all you have to change I do believe
Mail order tunes are real reasonable I say he just gets his OBD1 PCM tuned. What are you planning to do with your car??
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plus not sure if he switched PCM's he could tune it through and OBD1 port with and OBD2 computer? again not sure of that but better just to keep his in all reality
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