Try switching from whatever fuel you are using now to premium fuel - I'll bet you get better results. Have a lot of customers trying to save money these days in their higher perf engines (BMW, etc) trying to run mid-grade, etc, experiencing cold misfires. I'll bet that's whats happening here. If that doesn't do it, then your fuel pump is prob getting weak.
ignition misfire
Usual cause is a misfire. See related questions below.
Trouble code P0306 means: Cylinder #6 misfire detected
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