2010 Dodge Caravan 4.0 V6. p0153 code. I've checked a few things already. Vacuum gauge on the vacuum hose that goes to the power brake booster. That test was good, I believe it read 17mmhg. Attempted to smoke out the upper intake through the same hose. Didnt see any leaks. At idle, STFT on bank 1 oscillates between -0.8% and 1.6% pretty regularly. At idle, STFT on bank 2 is oscillating very slowly between -14.06 and 7.8. LTFT for bank 1 sits at 12. Bank 2 is 14. The van has simply cut off a few times when going at slow speeds (under 30mph). I can also feel a little bit of shudder once I get on the road shortly after cranking up the engine from being cold. Highway driving is good. No stalling or noticeable shudder. Replaced all the spark plugs a few weeks ago. Lastly... I have a big slice in the exhaust pipe that I attempted to patch about a foot down the exhaust past the cat and the downstream sensor for bank 2. Could this be causing my code or could it be something fuel related?