I really hope someone can help me with this. Purchased car drove a little over a week it just died one day never started again, cranks but won't start. Before this, I didn't have any issues with it besides some front end vibration that was getting worse. Replaced fuel pump thinking it was that. I have been told these codes won't cause a no start issue. Also has no pulse to the injectors for some reason. I took it to a shop they said it was the ecm cause it wasn't letting their computer read anything. They put a new ecm on, it started, ran like shit, they took it for a test drive, shut it off, car wouldn't start again, went back to throwing P2100 & P2101 codes ( throttle control motor relay circuit open & throttle actuator motor circuit range/performance) . I had another mechanic come out said my ecm is still good cause it's letting the scanner read the codes, he thinks it's the throttle body. All relays have been checked. At this point I don't know who to believe or know where to even begin. Help!