P0171 and PO174
P0171 and PO174 only will trip the code when the car is in park and idles for about 10 min. never while driving or if i dont let it sit and idle. after sanning the 02 were switching then going dead, then switching again, then going dead, back and forth. would it be safe to assume that the cause is bad 02's. the car was ran untuned with a cam for about a week. pig rich.
P0171 I had the same problem. Check the rubber hose goin into intake manifold on passenger side. Mine was leaking some. Just put some zip ties on it and I never had code again. Hope this helps.
