Vehicle has 77,000 miles, check engine light came on and stayed on recently, also began to idle rough and stall occasionally. Got 4 diagnostic codes of "fuel system bank lean" "fuel system bank rich". Replaced air filter and O2 sensors, had codes reset. But I'm still having stalls and rough idle, and check engine light is now blinking on and off. So basically, what I've done so far has done nothing but cost me money! Any ideas out there?

Busted intake manifold gasket. See the FAQs. I've had mine replaced 2x.

If you are the original owner it is a free fix.

Ryan, thanks for the info. But I couldn't find that heading under the FAQ's, replacing the manifold intake gasket. Sounds intimidating and expensive. Any more info would be appreciated. JD