2008 Silverado

[Johnnyray131]

About 3 months ago I started feeling the symptoms similar to torque converter shudder, but the symptoms come and go. As time has past, they appear more than they disappear unfortunately. So I started cheap and started replacing things that could mimic shudder symptoms. I replaced plugs and wires,because wires were starting to dry rot and plugs needed to be done anyways being I replaced at 70000 and now has 112. They looked pretty bad, being I didn't put decent ones in then "dumb". Actually ran good for two days and then symptoms came back. Symptoms are loss of power, the shudder between 40-55 "only time it shudders bad feels like a rumble strip" besides slight rpm fluctuation in drive and stopped "maybe 50-100rpm bounce"sometimes", and slight mpg decrease. The shudder is worse when going up slight grade and barely applying gas not enough to downshift. I tried slightly pressing the break like most people say to unlock torque converter if itself is the problem.well by doing the break test and maintaining speed the shudder never stops. Well today I finally threw a code on my way home scanned it when I got home p2270. Checked for exhaust leaks around the faulty sensor and checked voltage on sensor plug disconnect that go to PCM. No leaks, and voltage was fine. Could the faulty 02 sensor have cause all my symptoms? If so do I replace it or explore other issues like possible fuel injector malfunctions that cause the rear 02 sensor to freak out

[RyanbabZ71]

Wrong section, moved

[dkjbama]

http://www.gm-trucks.com/forums/topic/148383-dtc-p2270-p2271/