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Q:

running a little lean on 2002 Chevrolet Camaro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My fuel trims have gone lean over time. I have cleaned the maf sensor and checked the fuel pressure and it's good.
(1) Answer
(2) Comments
Anything below 15% is normal. These numbers are good. You might get them better by doing a complete Fuel Injection Service. If you want to know more about this e-mail me at nswaths3644@mypacks.net. It's refreshing to read that you know what to look for. E-mail me.
The long trims are + 6-10 while crusing. The short trims for the driverside can go up to + 12 for a sec. The long trims used to read - while crusing.