The problem started when shop put a new gasket to IAC valve recognizing a vacuum leak. The following were done while on Park and Closed loop
– so I loosened the bolts on the IAC (introduced a leak) and watched the FT for over 2 mins (130secs) – LTFT did not increase. RPM had few spikes as per OBDII but did not here a significant engine rev sound.
– After tightening the bolt, it took 50secs for LTFT to increase.
Also lat year P0505 was thrown. I just cleaned the IAC.
I am going to swap the IAC with a borrowed part. If it does not fix, I will be smoke testing.