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I have a sunpro code reader for my 89 GT. I got a few codes but don't have the instruction book for the code meanings. I will give them front ward and backward if any one knows what they are let me know please. (13,or 31) (12, or 21) (41, or 14) (91,or19) codes were recieve while engine was running.
 

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Ok... 13-31 normal idle not with in range,canister or egr valve controll system


12-21 Idle speed controll out of range, coolant temp out of range


14-41 ignition profile pick up erratic, o2 signal lean mixture


19-91 erratic idle speed signal, o2 problem fuel pressure out of specific range or injectors out of balance


Sounds like you need a few things
 

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Sounds like some sensors might need replacing.
 
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