bad gas milage and jerk up hill on heavy acceleration

]I have 2004 Nissan quest sl 3.5 vde .im getting bag gas milage also on heavy acceleration up hill jerk few times ,no engine light or pending code I also notice when the the jerk happen when the fuel near empty like around 2 stroke on the fuel guage.I must stated im not a mechanic but im handy around car some what, I post a video on youtube here is the link

im asking if some can please review it and let me know what those numbers meant, im scared to go to the dealer,last time I was there cost me $3,800 cant afford to go there, thanks

Have you checked for a vacuum leak?

The reason I say this is that your total FTs seemed to get better at higher RPMs. Yes? Remember to combine LT and ST for each bank.

If you have a MAF, please see if it is dirty.

These are just guesses since I'd want to run more tests if I were there. Like check spark strength, other sensor values, such as ECT and IAT.

Hey David7!

Your jerk on uphill acceleration would tend to suggest a single cylinder misfire. I'm surprised there's no codes? :huh: Is this a US market vehicle?

The trims you're seeing do tend to suggest some kind of vacuum leak, as GeekDIYMechanic suggested. The good ol' water test or brake cleaner (carefully applied) is the way to go. Intake gaskets are especially suspect, with the manifold being plastic.

I'd suggest watching your trims, as well as your O2's and Calculated Load during heavy acceleration. Get someone else to drive or hold the camera if needed. I know that your trims were better off idle, but under heavy load can often be a different story.

Also know that the B1S1 and B2S1 O2 PIDs you saw are not conventional O2 sensors, but air/fuel ratio sensors. The PIDs you're seeing is an 'interpreted' representation of the sensors actual output. A poor representation, actually. :lol: Just know that going forward.

Thank you GEEKDIYMECHANIC ,for taking my question ,I really appreciate it that you take your time to answer my question ,i did change maf sensor and ect sensor also new spark plugs and the 3 rear coil . when the engine fully heated up coolant temp around 187-190.i did smoke test the system and the egr were leaking I replace it also the throttle body gasket and intake ,do you think I have faulty b1s1 sensor the reading seems off ?

THANK YOU TYLER ,I really appreciate you take my question,i did a smoke test and my egr were leaking and I replace it ,about my video what was worring me its that b1s1 fuel ratio sensor seems off ,thinking its bad or lazy.what do you think about the sensors ?, I have new plugs,3 rear coils are new, new ect sensor,trottle body gasket new,intake gasket new, by the way the intake its aluminum and to your question it is usa market vechile, someone from Nissan told me to disconnect the maf while idling and check fuel trim it should go to -25 which mean there is no vacume leak and i did, and both banks went to -25 .what do you think about that theory ? thank you Tyler.