05 T&C 3.8L P0135& P0306 Help

Can't seem to get these codes to go away. Has New Plugs & Wires. The 2 o2 Sensors, EGR Valve, Coil Pack. Has Rough Idle And A Slight Stumble at 45-50MPH. Could It Be A Possible Intake Manifold Leak? Thanks David.

http://www.obd-codes.com/trouble_codes/generic/p0135-oxygen-o2-sensor-heater-circuit-malfunction-bank-1-sensor-1.php

http://www.obd-codes.com/trouble_codes/generic/p0306-cylinder-6-misfire-detected.php

Take a look at the fuel injector on #6 yet. Spray brake cleaner (no residue) around the intake manifold gasket and listen for an RPM change. Indicates a vacuum leak.

Hi Rip, Thank's for the input. I can Feel thr injector plusing so i think thats a good sign.sprayed intake dosen't seem to efect the engine rpm but very difficult to spray the intake.At this point i have taken the pellum off and going to replace it tomorrow i will let you know if i gain on it. David.