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I have a 4th gen firebird with the 3800 v6 and I get this code and I can't figure out why I changed throttle body still no change it happen once in a while my reduced engine power come on. Code are p1516 p1220 p1120
 

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1994 Firebird Formula 381ci LT1 / TH400+GV O/D
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You can download a free copy of the 1999 factory service manual here;


Codes are fully explained, with logic diagram for diagnosis. Does require a Tech 2 for complete analysis.
 
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