2014 Chevy sonic 1.8l PO171 code

[Kholbrook]

Looking to get some advice! Car randomly started running weird during initial take off. I had a code for the intake manifold tuning control valve positions sensor, come to find out they are known to break the arm off that opens the flaps inside the intake so I order a new arm and put it back on. Oddly enough I didn’t have troubles driving the vehicle until I fixed that code, without the arm it seemed to run fine. Fixed the issue and now at initial take off at about 2500 rpms the engine falls on its face and there’s a chattering coming where where that control valve position sensor is from what I can tell, so today I change the control valve. Didn’t fix it, but now if I flat foot it while it’s going into reduced power it seems to come out of it and run fine until I shut it off and take off again. Any advice? Thanks in advance!!