When I first start my car in the morning, I hear a hissing noise for 10-20 seconds then a pressure release sound (please see video). In addition to this the acceleration power is reduced, shifting is not smooth, idle RPMs appear high compared to before, and I occasionally have engine shake when idling.
I have had the throttle body cleaned and programed based on mechanics recommendation which seemed to provide some temporary improvement however the problem returned the following day.
Video (Click to make bigger)
Monday, February 24th, 2025 AT 2:18 AM