Vehicle has a P0171 stored. LT bank 1 is +25, bank 2 is+10. ST on bank one ranges from -3 to +3 then the engine starts to stumble and ST goes to +20 area for a couple minutes, then returns to +-3, then back to +20. Does this dance every couple minutes. Bank 2 ...

FIX posted 8/21/2012

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