If your problem is carbon buildup around the throttle body butterfly valve, the TB can be removed and cleaned pretty easily to rule that in or out. There are instructions here somewhere on the forum for removing the TB if you've never done it before. That may not help your issue but it'* something to try and won't cost you much and can only help your system overall.
For $5-6 you can buy a can of Seafoam engine treatment, and follow the instructions to run it through the engine via the air intake method. One of the vacuum lines connected to the side of the throttle body usually works well for that. That'* another method to break down carbon deposits throughout the top end of your engine.
Current GMs: '95 Chevy Suburban C2500, '69 Pontiac Executive
Former GMs: '83 Buick Park Ave, '73 Buick Electra, '92 Chevy Caprice 9C1, '98 Pontiac Bonneville SLE, '99 Olds Aurora, '00 Buick LeSabre