Of course he has a lot of faith in BG44K...he gets paid to sell it to people
.
I use Sea Foam and do a 3-part cleaning, 1 can in the tank, clean the throttle body with TB cleaner, and clean the intake manifold/injectors/passages with it running by metering another 1/2 can slowly through a vacuum line. Works really really well. Basically, a fuel injection system cleaning replaces rebuilding a carburetor on older cars.
Did cleaning the throttle body fix your problem? You never said. These drive-by-wire systems in the small pickups and TrailBlazers are very common for getting excessive carbon on the throttle bodies and messing things up.
Your clutch is hydraulic and does not have any way to adjust it. You could try bleeding it (usually only needs this if the clutch engages too close to the floor/has excessive free travel at the top).
Do you have a check engine light on?