Question

2005 Pontiac GTP 3800 with engine code P0068 and P0101. My question is when going down hills is when I get power loss engine light and no throttle response.

Answer 1

P0068 Throttle body airflow performance

P0101 MAF (mass airflow performance)

This is geniunly a MAF problem you can perform a MAF cleaning if that does not do it a replacement of the MAF will be needed

Answer 2

P0068 PONTIAC - MAP/MAF - Throttle Position Correlation
Read more: https://www.autocodes.com/p0068_pontiac.html

P0101 PONTIAC - Mass Air Flow Sensor Performance
Read more: https://www.autocodes.com/p0101_pontiac.html