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I have been having a recent problem with my Z. It takes longer to crank start and then became down on power, getting me into trouble when I pulled out and thought the car might stall when I gave it gas. It hesitates constantly.
Finally this morning it threw a code of P300 and B2607. Random misfire which I already can hear and B2607 & B2609 steering lock , and B2631 sun sensor.

Help! Car Idles Rough, Won't Accelerate, Service Engine Soon Light Flashes, Code P300

And ordered MAF cleaner.

The codes were reset and am waiting for what happens next.

Do you have any input?
 

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Let us know what your mileage is, and what kind of mods might be associated with this problem.
 

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A P0300 can be thrown for a LOT of reasons. Before you start swapping parts, I'd monitor some of the the sensors (eg, knock, O2, camshaft position, etc) that can cause a P0300 and verify they are working properly.
 
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