I have a 99 Camry XLE V6 with 134000 miles, and the following codes have appeared: P0300, P0302, P0304,P0306, all misfire codes. It runs a little rough when at idle, but it seem to be smooth when moving.

Changed plugs and wires, cleaned throttle body and IAC, new O2 sensors.

ANy thoughts?

Thanks
Steve

 

P0302, P0304, P0306 - cylinders 2,4,6. Are these cylinders on the same side of the engine? If so you may have a vacuum leak on that bank. Vacuum leaks will show up more at idle than at speed.