Hello! First post on this forum. I've been having a difficult time trouble shooting codes p0172 and p0507 on my 2007 3.4 L Equinox LS. I recently replaced my rear and front valve seal covers, cleaned my MAF sensor and replaced the throttle body. Before I did any of that I was getting a p0171 Lean code, but after replacing everything I am now getting a p0172 and p0507. My RPMs shoot up to 2000-2200 when I'm in park and go down to about 1500 while driving at consistent speeds. I tried a throttle body relearn multiple times and also driving above 44 mph with a few deaccelerations and it didn't do anything, so that's when I decided to replace my throttle body, but both codes and high RPMs are still prevalent. No vacuum leaks are present, I changed the oil, I reset the ECU and I did a fuel injector cleaning, but nothing has helped and I'm not sure where to go from here. Thanks for any help!