Engine Performance problem
2000 Chevy Venture 6 cyl Front Wheel Drive Automatic 107000 miles
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3.4L-Had a code for camshaft positioning sensor. did voltmeter test and determined it was bad. replaced sensor and everything was fine. Short time later developed a studdering or missing sensation while driving. Soon after Engine lite. Downloaded codes------P-0131- o2 circuit low volt sensor 1
p-0137-o2circuit low volt sensor 2
Sensors checked out ok cleared codes . Still have this studdering miss mostly while driving, sometimes while at stop in drive. Sort of felt like trans.,but no shavings in pan,fluid fine even flushed transmision. Not getting any more codes.Also changed fuel filter.Engine seems to idle fine and respond well. I could use any help at all. Tommorrow I'll check fuel pressure and intake suction. Please give me a clue!

Low voltage on oxygen sensors indicates lean condition. Beings its both left and right bank lean codes, it sounds like a vacuum leak. Might want to check all around where the camshaft sensor was replaced to see if something was left off or a vacuum line was broken.