2005 Crossfire Limited.

For about six months the only code I have had is P2098 Bank 2 Post Catalyst Fuel Trim System Too Lean. I replaced the 4 oxygen sensors but have not been able to solve it. The car has run fine with this code for six months.

I had a problem starting last week and replaced the Crankshaft Position Sensor without success and then discovered fuel pressure was not being maintained after initial build up. I replaced the fuel filter and that solved it. Ran well for a week.

This week it began starting and running for a few seconds then shutting down. I have good fuel pressure.

I cleaned the MAF and replaced the RCU (Relay Control Unit). No change.

At a loss. Any suggestions please?