[Kerberos]

Wife's Trailblazer was doing the same thing... cleaned out the Throttle Body and took the brake vacuum line off of the vacuum booster side (the other end should go into your intake manifold somewhere) while the engine is on and at idle dump about 2/3rds can of Seafoam into the hose and when the engine starts really sputtering shut off the motor. Wait about 15-20 minutes for the Seafoam to soak valves and pistons. When you start it back up the smoke will cover your neiborhood. Mosquitoes will die. But you have to keep the engine at 1500 to 2000 RPM for 5 seconds at a time till the smoke is gone. Once you clean out the intake, valves and pistons it should run better. Since you have over 100K you might do this again within 2K miles to help get rid of what the first dose didn't. After that every 10K. This helped my wife's 100K Trailblazer run like new.