I realized I put this in the wrong area and moved it over to the regular Lancer section....

To get to the point: has anyone else set up a piggy back ECU from Road Race on a 2008 Lancer and had problems with the check engine light? It's throwing a P0171 error sporadically.

More detail:
I have a 2008 Lancer with the Cali ECU (detuned and all that good stuff). I recently added the piggy back from Road Race Motorsports. The car seemed a bit quicker, but the check engine light came on after a couple of days. The error code is P0171, and I'm not sure what that means for the 4B11 engine. From what I can find, for a lot of other Lancers, the code indicates the engine is running lean.

The check engine light seems to come and go, however, making it hard to figure out just what's going on. It went away on its own, then came back after about 4 days. It went off again the other day, then came on a few days later (today). I've had the piggy for a little over a week, so I'm thinking that maybe the car is still "learning," but I'm worried that this might be damaging the engine or causing some other harm.

When I talked to Road Race about it, they said that it's happened before and the code went away after a few days for another customer. They have mostly dealt with the "Federal" ECUs (no Cali smog detunes), so I'm wondering if this is something resulting from that or what.

Any advice on this would be most appreciated. Also, if anyone else has run into a similar problem, please let me know what you did to resolve it (if you were able to).

THANK YOU!!

P.S. Nothing against Road Race! They've been awesome...I just want to get this figure out before anything bad happens!