I have a 2003 Trailblazer. We replaced all the plugs, ignition coils, and removed the throttle body and completely cleaned both sides. The vehicle appeared to run smoothly until it warms up, about 30 minutes of driving. Now it accelerates on its own and is very hard to brake and stop. Once stopped the suv idles rough and seems like it is going to stall. The suv attempts to keep going causing hard braking until about 5mph when it stops the acceleration all at once making the suv brakes to lock up from all the pressure being applied to stop. Once moving forward again, the idle takes over and accelerates endlessly. I allowed it to go to see just how much it would accelerate and I started to apply the brakes once the suv broke 55mph. While coming to a stop I shifted to nuetral so I wouldnt be fighting against the engine and the RPM's shot up to 4k and were increasing until I placed it back in gear to prevent damage from the high RPM's. Does anyone have any idea what is going on?