I've been struggling to find the cause of this intermittent misfire my car has been having. I've changed all the plugs and coils as well as adding 60lb injectors before my retune. I will also add that the car had the issue with the old coils plugs and stock injectors. It tends to pop and stumble on hot startups and last for 15 seconds or less then it clears right up and runs perfectly. It has only done it once on a cold start. Keep in mind it does not do this on every startup, only once in a while. Sometimes it will do it a few times in a day and then it can disappear for a week and not do it at all. My initial though was maybe a lazy lash adjuster that takes a few seconds to pump up. But I don't believe that would cause a misfire or stumble. My second guess was possibly a lazy secondary chain tensioner thats bleeding down and allowing slack in the chain that may throw off the cam timing. But if that were the case I'd imagine that there would be audible chain noise or clacking. The popping can be heard more dominantly on the passenger side as well as through the passenger side tailpipe. I've been trying to datalog the issue but naturally the car will not do it when I have my handheld/laptop plugged in. The stumble is worse sometimes and not quite as bad other times. Here's a video below. It clears up by the time I get around the passenger door
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[youtube_browser]7NOlIJ-biVg[/youtube_browser]
