Hello Guys,
I just got my PCM back from PCMforless a few days ago. Put it in and drove around today. It ran fine for maybe 30 minutes, Then I started getting a P0171 code (system too lean).

I can clear the code with my scanner, and it comes back after 10 minutes of driving. I have had it give me the code while sitting at a stop light, Accelerating, or just cruising down the freeway.

The car is running fine, other then the P0171 code. I have never had that code before the Tune. And Nothing had been done to the car while the PCM was out other the rear diff oil change.

Is there any thing that could have been adjusted to much durring the tune to cause this? I called the tunner and he told me to clean my MAF and check my vaccum lines. I cleaned the MAF and all the Vaccum lines and good and tight( I replaced all the lines and elbows a few hundred miles ago.

Thanks for any advice you all can give.