intabaa

Hi! So i know its most likely the throttle body needing cleaining, i recently purchesed my car and 15 minutes after leaving the dealer i got the codes. i got reffered to a mechanic who said my throttle body was recently changed and was fine and it most likely was a wiring issue. The dealer is not accepting the bill to fix the car (im still trying to make them in different ways). Problem is i need my car working and im still driving around in it even though it usually is in limp home (not getting the codes all the time) and ive tried to clean the throttle body either way and still getting the same issue ie intermittent codes. Just now when driving about 500m from home my engine started to stutter and loose basicly all power, i got it home and restarted and it ran normally again. As the dealer takes alot of time and i need the car what would be your steps to fix it? Buy a new throttle body and ignore what the mechanic said? Is there a usual other issue that it could be that i cant find online?