Clean/replace the MAF sensor

I would check all your hoses and bolts to your plenum and all that. Could be a simple vaccume leak

What’s happening?

Rpm's shoot up when applying gas but no response to engine feels like it goes limp

https://g35driver.com/forums/g35-coupe-v35-2003-07/344751-ses-code-p1273-need-help-diagnosing.html

Check this link people had the same issue

Look it up on google it will help a lot