Hey guys, last night I went to a car wash where you spray wash your car with a high pressure washer and and sprayed brake cleaner to all calipers and discs and pressure washed them clean. Then today, I went underneath and checked the emergency brake line at the rear of the Tahoe and it looked like it was hung up and really tight so I loosen It Up by wiggling it and loosened it up and got it free I also check the connection to the PCM I believe is back there underneath the spare tire and sprayed a whole bunch of electrical cleaner and checked if the wiring harness to the PCM was all the way in and it was loose so I made sure it was nice and snug and since I was down there I sprayed every electrical connector clean cuz they all were really dirty I drove it and wow what a difference with like throttle it was smooth all the way through. Another thing I did was check the drive shaft the front drive shaft kind of wiggled so I turned it until it I couldn't move it up and down and then I put a hose clamp on the rear drive shaft kind of like adding a weight to it, I felt around and it felt like a low spot so that's where I put the hose clamp the screw was like on the low spot side if you can imagine that, but anyway whatever I did it seems like the Tahoe was running smooth even at the highest temperature at 180 degrees. I'll drive it some more and fill you in if it's not doing the shutter anymore. The main thing I was trying to accomplish was making sure that the brake calipers and the emergency brake was not binding or holding up the Tahoe on light acceleration. Because those emergency brake lines can get rusty, and on light acceleration I'm thinking any binding on the brake could be fighting the light acceleration and even Tc clutches and make the vehicle shudder. So far is pretty smooth even on a warm day and transmission temperature at 180 degrees where the normal shudder would start at around 155 degrees on transmission temp on up. So check your e brake lines, there are 2(left and right rear) and electrical connections underneath.
