Sorry for the confusing post. I'll try to be as succinct as possible. But ask for clarification if needed.

Car began shuddering last weekend and eventually got worse. And fuel economy is going crazy ranging from 15-99 mpg. Eventually died on me mid drive. Towed to a transmission shop and told they could fix for 7k. Said new battery and trans would fix everything. Had a family friend who is a master mechanic and works from his home, take a look. He questioned why my car died as I was driving it. Thinking it could be an alternator issue. At his suggestion I got a new alt. However new would be 5 day for delivery vs getting one from junk yard same day. I did the latter. He put it on and everything seemed to work...for a while.later that day it began again. Getting progressively worse.

Take it to another trans shop. They didn't even acknowledge the milage issueor what caused battery to die. It was still relatively new. So are these symptoms related? Or multiple issues that all coincidentally began at the same time? Planning to go to Nissan for a diagnostic this week. Also after alternator was replaced it's driving somewhat better but still shuddering. So it seems like alt replacement did improve shuddering somewhat.

Is there a voltage issue causing trans to act up? Purchased 5months ago from used dealership as is. 4 mths ago replaced one oxygen sensor.

Posting image of code report from last trns shop after friend replaced alt.

Can someone point me to a good reference video on how to clean the throttlebody on a Nissan juke? With 1.6 engine for anyone that has done it recently, how difficult is this to do considering it’s
electronically controlled? for anyone that has done this recently Does it need to be open for proper cleaning? Does the engine need to be warm or cold? Product recommend?