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Forums/Z31P/z31-performance-upgrade-forums engine-management/my 87 na runs rich im pretty sure and slightly misfires but not all the time.

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84z31t: (2013-09-18 16:37:25)

Hey guys. Question for ya'll. My 87 Na runs pretty rich I think and it mis fires but only sometimes and its not a heavy miss either. Sometimes I het great gas mileage and sometimes I can see the needle drop when I'm just idling. Any ideas.

Augustus Maximus: (2013-09-18 18:04:17)

Replace your 02 sensor.

michaelp: (2013-09-26 15:33:11)

Could be O2 or CHTS. I generally just unplug the O2 sensors and forget they exist on Z31s. You could unplug it and see if it runs fine, that would confirm if its the issue or not.

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