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· Premium Member
01 VDC, 05 R Sedan, 06 BAJA EJ257
19,478 Posts
The heat range of the OE plugs are a large factor as well. The ability for the plug to transfer the heat makes a large difference in the way it fires.

There may also be a sensor that is slow to react. But unless or until the MIL comes on with a code stored you would have to check each one independently.

Try a set of NGK plugs and change the PCV valve or clean it. Also, clean the throttle body and add a can of Sea Foam to a full tank of premium unleaded to clean the system of varnish and carbon.
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