Got code 1088 and 1090. P1090 Tumble generator valve #1 (RH) malfunction (stuck open) and P1088 Tumble generator valve #1 (RH) position sensor circuit low input. Any ideas on what's going on or how I can fix that. Or if it's a major problem. Got 03 Impreza WRX. It drives the same when I first got it. Just wondering what I need to do. Thanks for any help.