Are you using OEM parts? What plugs you running now? Bucking so I'm taking a guess it's a 5port? Change coolant temp switch .. run 91 octane and test MaF and replace if bad with OEM. Best I got with the little knowlage of your car.
the only oil you are gonna want to use for your MT transmisson is Redline MT-90 75W90 GL-4 Gear Oil. this isnt something you cant buy at auto zone or o'reilys.turned out the knock sensor code which was thrown with coolant temp sensor was only due to an old and corroded coolant temp sensor..
car has stopped bucking, and threw in new plugs for the extra reassurance..
now onto changing the MT oil as i doubt its been serviced in 60k+ miles..
do we choose 75/90 for the LSD or 80/90?