My PI head swap began a year ago and I have not been able to completely finish the project until now. I had several issues in the process of finishing the project which halted the project. I had issues such as a major accident as well. Well, enough with the excuses here is what is going on. The engine starts right up without issue. during idle it almost seems like it is misfiring. It runs pretty rough but not all the time, there are moments of smooth idle. Off idle it runs pretty smooth. I dont have any vacuum leaks the gas is over a year old, I have octane boost in the gas. (possible issue?) No Stored codes, no pending codes It seems like i may have an issue caused by low octane and the fact that i am running with old gas. I have 3/4 of a tank so I dont think adding high octane fuel will deliver drastic results. That do you guys/ gals think?