u/Aggravating-Club-235

I have an 89, and for the past couple of weeks it has started to vibrate but only on deceleration once I get down to like 15 mph or so but driving normal speeds is perfectly fine. I know it’s definitely the driveline ofc but do you guys think it’s more so the u joints that need to be replaced or is it possibly the pinion angle etc. for reference I have a 5.5” long arm kit and a SYE. Also I know it’s definitely not the rear diff I already pulled the cover and everything was perfect.

89 xj here. Have a small power steering leak I’ve just been lazy to fix but this noise is new. Sound is coming from power steering area forsure , don’t know if it’s the power steering itself or not. The hose to the right of the power steering fluid housing is what’s leaking slightly but if it’s making this almost grinding noise should I just replace the whole thing? The bearing maybe is what’s making the noise?

I need to pass smog to get new registration , highly doubt I will pass as of rn. My question is what should I do? I know I have some sort of air/fuel issue. whenever I turn the car on first thing in the morning it idles normal for a little and then every so often as it’s warming up, it will stumble and almost stall, and then go back up to a normal idle and keep doing that until the car is warmed up, once it’s warm it idles’s pretty normal and drives fine. Any one else have this issue or know what it could be ?