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I have an 06 323 with 496. My port engine randomly misses. Of course when the mechanic is there, it does not do it. I bought it 3 years ago and replaced the plugs and did a lot of maintenance that needed to be done. Does anyone else have this problem. Where would you start on fixing this?

Plugs and coil add a fuel cleaner. Could be a injector too. Does it every set a code. Would be nice to narrow it down to a cylinder.

When does it miss - idle, acceleration, cruise, or top end?