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I'm looking for some help...my idle fluctuates from 1000 to 2000 rpm especially at start up... But also does its when warmed up and driving. This started a couple of weeks ago.
I've also been getting a bank 1 to lean code going on and off for a couple months.
I had a used '04 L32 and N* installed a few months ago as well...
Any ideas?
Thanks for the help

Vacuum leak. Use carb cleaner and spray the gasketed surfaces and the vacuum lines and if the idle settles down for a second when you spray a spot, that's the leak.

Did you get the appropriate tune for the different TB and MAF?

If you are getting a code, have you tried replacing the oxygen sensor?

Also could very well be the MAF readings if it isn't a vacuum leak.

Check for vacuum leaks as Ed mentioned. Then try the MAF sensor.