I have a 2010 Subaru WRX with 49,000 miles, and I'm having issues keeping my car running. I'm running the AP Stage 2+ SF 93 map with the Cobb SF intake, Cobb downpipe, and Invidia catback exhaust. I recently just installed the downpipe and changed the spark plugs. The first time I drove my car I couldn't go over 30 mph because it would bogg itself down really bad. It even died on me a couple times turning corners until I let the clutch out. I decided to change the spark plugs again to see if it would help solve the issue. It started misfiring in cylinder 3, and then eventually started misfiring in different cylinders. I changed the spark plugs again with OEM spark plugs from Subaru, and the misfiring issue stopped. I've been having the issue with my car idling really weird. It starts off idling normal and then drops down to where it almost kills itself, and then jumps up to around 3,000 RPM and then back down to almost killing itself. Some times it does kill itself, but after the misfire issue was fixed the time in between the idling problem would get longer and longer. It eventually stopped doing it so I tried taking it for a test drive. It died on me 10 feet from where I started. It wouldn't start my first three tries, and when I finally got it to start it sounded like a dirt bike. If anyone has any idea what could be causing this, your input would be greatly appreciated.