hesitation

Hey all! I have a 1997 TJ 5sp manual 4.0L I just replaced pistons, piston rings, some bearings, and gaskets all around (except the oil pan gasket). this project took way too long and I was getting excited to have her back on the road. after putting everything together and getting her running and...

In December I experienced a flashing check engine light while driving. I replaced all 4 O2 sensors and those seemed to smooth everything out. That thread: https://wranglertjforum.com/threads/check-engine-light-flashed-while-driving.67087/ Since then I've experienced two instances of hesitation...

My 2002 TJ, 4.0 L I6, 3 speed Automatic, has been recently hesitating when cold, it idles a little higher and the brakes are very stiff and reactive. Once it warms up this issue is gone more or less, anybody got a clue what it could be?