Quote Originally Posted by Reptile View Post
It probably should be said that random misifres are common at idle, but random multiple misfires are not, so there is another problem that causes a P0300 code to flash.

I've never messed with a SSM90 kit personally, but I have heard that there are inconsistencies in the machining for the injector seats. That being said, if there were a vacuum leak that was bad enough, you'd be looking at lots of problems caused by lean issues, or even a bad fuel spray pattern. All that together can cause misfires, idle issues, even loss of performance from lots of reasons.
I don't have these specific problems with the Intense PCM though, only the ZZP one. So it couldn't be a vacuum leak, because otherwise it would be happening on every PCM I use.