My Space Wagon Spins

Hello dear Mitsubishi fans ! I would need some help….My Space Wagon , Built 2002 , 2.4 GDI spins completely . In May 2009 I had problems with the accelerator sensor , newly bought and built in , since which no problems until now . Last week I drove still in the morning by car , in the evening sat me in , wanted to drive away and the car did not jump any more . From loud temptations of course the Batteri also went out . On the next day I got a mechanic and the Geraet has read out the error, and turned out, error code 92….so… air mass meters. I bought a used but with warranty and installed today, the car makes as if it was starting but yet does not. And quite interresant, either error code 92 returns, or 92 with 78 (gas pedal sensor), or only 78, after deleting I try to start but after few turns, exactly then when starting should remain off. Couple of revolutions because the battery is quite weak, was not properly charged. Does someone have an idea what that could be ?….and why can two things at once just get broken from standing around? So, as I said, the battery was not very strong today, after three-four temptations it went out. Could ev. be due to the battery, of course if the voltage is way too small then the control spins? And another question…I left with the mechanic the third key…could be d ass the service key is not suitable to start the car? I exchanged the accelerator sensor last year, installed brand new and since that no longer had any problems. I just can’t understand it. Mitsu workshop I have in the vicinity in Eisenstadt ( Austria) , Denzel , but they are very weak… the last time have looked around four days and done nothing, as even the technician told me to the accelerator sensor that is the cruiser and was getting pretty sc hwer persuade….na clear that I took the car away immediately. Please write me what I can do. Any idea could help me. Thank you ! With kind greetings , László