Rough idling, vibration, jolting acceleration - 98 S70

[hamhead]

Thanks. I ordered a new sensor. I checked the battery connections and they look fine. I'd actually given them a thorough scrubbing when I changed battery. Nothing looked loose. Any other ideas?

[abscate]

That looks like an evap hose that is loose - and that will cause bad idling, running, and those P04xx codes, misfire, etc.

They don't put hoses that go to nowhere on cars anymore!!

[hamhead]

Thanks. Now just to find out where that hose was originally connected. Is there maybe a hose diagram for that part of the car?

Even more pressing now is the electrical issue as the car won't turnover 100% of the time as opposed to 50% like before. Just a click and that's it. Hopefully it's the battery needing re-charged. The two main battery lugs up top are tight as a drum. Are there other battery connections I should check? Any other thoughts on potential causes for this?

Also, where do I insert the tube for blowing the smoke? I'd seen where Robert DIY used one of the nipples on the vacuum tree which is what I did. Do I have to block anything off for this to work?

Thanks again. This guidance means a lot.