My gf's 00 GTP keeps setting a System too rich code. We've replaced the air filter and cleaned the MAF. What else could be causing this? It doesn't stay on either, it'll come on and then turn off a while later. Her car doesn't run any different though.

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Previous: '99 GTP 246 hp, 350 ft-lbs dyno tested
Current: '07 G6 V6...slow

"Wide open 'til you see God....then brake."

If there are no other codes being set along with it, low fuel pressure, a leaking fuel pressure regulator (check for fuel in the vacuum line), bad injectors, MAF sensor, TP sensor, O2 sensor, dirty throttle plate and IAC passages or bad IAC motor, damaged or restricted throttle body screen, or fuel soaked EVAP canister can cause a system too rich code.

the 02 sensors, and mine had a really bad fuel pressure reg and i got a too rich code and a few to lean codes

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