P0102 mass or volume air flow circuit low input is the only code coming up. Clear the code and start the car snd the code is back within seconds. Car has unstable idle and stays in limp mode. I'd like to have the maf checked before I pay 250 for a new one. The 04-06 upgrade is kinda an option but do you have to have a tuner device to fix the idle on the 04-06 maf upgrade? I'm assuming my maf is bad and the reason behind limp mode. Any input?