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P0171 1998 chevy lumina ltz 3800

I have a PO171 lean mixture, bank 1 code.
I have had MAF sensor replaced twice. Check engine will come on and sometimes shut off. Mostly on. Under hard acceleration, engine pulls strong (235,500 miles) but near redline there is a slight hesitation. Almost like engine not getting enough fuel. IDK for sure. I take excellent care of car and engine. Synthetic oil. Intake gasket replaced, as common problem with 3800's. I use 89octane, sometimes 93. Problem seems slightly better with 93. I'm guessing low fuel pressure or vacuum leak.
Vehicle: 1998 Chevy Lumina LTZ 3800 Series II
asked Jan 24, 2016 by PO171, bank 1, lean

1 Answer

Vacuum leak is more common when you have a lean fuel trim, If the CK ENG LT comes on during hard acceleration, have a exhaust back pressure check, Using synthetic oil with this year make and model will do more harm to catalytic convertor.
answered Jan 25, 2016 by Reynaldo (10,835 points)

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