When reading the o2, should it be done in park or drive?

Also, to pass emissions, what should I be shooting for.I know 14.7 is the ideal A/F ratio (.6 mV I think). I'm using a one wire o2, right now in park i'm at .7/.8 at idle in park. I have less than 100 miles on the engine and have a part throttle miss i am trying to figure out. I was told I may have some rings that have not seated yet and causing a miss and that I should drive it more then try for tuning. Sound possible??? Ideas/info appreciated.

thanks.

 

All I really want to know is if I should be checking under load.

 

if you want to check your mixture at part throttle, under load, then read your O2 reading at that moment in the car. reading it at idle will tell you your idle mixture, (obviously)


I don't think jetting or rings not seating would cause a miss. Usually igntion related...

 

Well guess I have some more detective work to do.

Thanks.

Good luck on yours!!!