What code do you have now?.. I'd get ECU talk ( Free ) and Consult Cable ( $35 or so ), and start looking at what the ECU is seeing.. If the ECU is pulling timing during the 2-3 range, you will see it in the ECU talk display.. and then you know you have a Knock or Knock sensor issue.. Do a compression test.. that will tell you if you have a '90 replacement engine.. Cj
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