I was getting code 34 and then replaced the mass air flow sensor and the got code 33. I could be driving down the road and when i would push the gas it wouldnt want to go and the rpm's wouldnt go up they would drop to around 2000 and not move. I checked the voltage on the mas sensor and it is okay but when i checked the MAF relay for voltage i didnt have any but it was just turned on and not running so i dont know if that is why there was not voltage? Could the ECM be the cause of all of these problems cause i put a new relay in it and now im getting both codes 33, 34 what should i do