Hi Fellow Benzers; my 2000 ml430's 1-4 cylinder is misfiring continously even though the plugs were firing and injectors hve an audible clicking sound. O2 sensor #2 on #1 O2 snsor bnk had been replaced also. Injectors 1-4 had been pulled out and cleaned but engine still running rough and above problem is showing on analyzer. Pls help :

 

catalytic converter! clogged up