Can a bad knock sensor and oxygen sensor cause a shudder? on 2000 Nissan Pathfinder

I recently bought a 2000 Nissan pathfinder. The service engine soon light came on as I was driving. The codes ran as a knock sensor and oxygen sensor in bank 1 and bank 2, high voltage. I notice around 35 mph the engine or transmission shudders. The car sat on the lot for a couple of months, so my first reaction was old gas. I filled it up with plus after running all of the old gas out and adding sea foam. Does this sound like a transmission problem or could a knock sensor be causing the shudder? The car switches between gears at low speeds without problems, including taking off.

by in Huntington, WV on October 27, 2012
1 answer 2 comments
ANSWER by , October 28, 2012
Does it only 'shudder' under light throttle? If so , it may be internal trans problem. Best would be to have a trusted shop test drive it WITH you to confirm the symptom , and go from there. Maybe check with Nissan for any related service bulletins that may help.
COMMENT by , October 29, 2012
It tends to shudder after it has shifted smoothly. The knock sensor code is showing a detonation code. Could this be affecting it? Or the ignition timing?
COMMENT by , October 29, 2012
Knock sensor helps the PCM determine the right amount of spark advance. STILL recommend having it diagnosed , even if it's something that you decide is not worth bothering with. This way at least you'll know if it's a good time to sell?