New to the forum. Bought a used 2006 RRS HSE 4.4. 90k miles. Having intermittent Reduced Engine Performance Warning’s. Happens every couple of days. Stays on shortly and then goes off. Engine has stalled 3 or 4 times while driving at very slow speed (parking lots). Throw it in neutral and restarts immediately. Throwing codes 172 and 175. Already replaced air filter and put in genuine MAF sensor.

Dealer cleaned throttle body and said everything was fine. Ideas? Thanks!