Hi all..Having a problem with this truck..It runs fine for 30-45 minutes then the engine starts to stumble and gradually starts backfiring but keeps running.If the truck is shut off when its in backfire mode it wont restart till it sits for awhile.Its throwing a 771 code which I was told is a bad 02 sensor... I changed the 02 sensor but it still does the same thing..The LP Reg and Mixer/Electric throttle body have been changed not long ago..Any help would be much appreciated...Thanks
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