Update. I agree that vacuum line could have same result and I have checked the 1 that I was a where of that comes off the 'blob' duct work that's hidden under top cover. Sort of looks like small 90' pcv valve and connects to steel line. Rechecked wiring ect. I took it on a mostly highway run about 28 mile round trip and that helped slightly. When I got back I checked this thread before having to run again. Going off of Roadie's reply I took regular streets instead of highway. It got better with every complete stop I had to make. Never hoped for red lights before. It seems to be relearning with each stop and the performance is coming back. It was running rather flat from a rolling get in it hard scenario. I assumed disconnecting battery would reset to factory defaults. That work with the I-6 Trailblazer I had witch I figured out the 1st time I cleaned it's tb and didn't follow step #1. Disconnect battery. Had similar issue then with idle would spike last second when stopping. I believe Roadie cought me on that error. Other than knowing this issue yesterday was just not right, my daughter was driving Tahoe to work night shift. That bothered me more than if I was the only driver. I will be checking back with this thread hoping someone know's a way to prevent this idle issue when cleaning tb and 'sticky' it as it needs to be known. Its stupid. This could bad results for inexperienced driver and/or just piss off experienced DIYer. Thank you all. And yes, interruptions can cause mistakes, glad I proofread this.