hey guys, i am new to this site but i just bought a 2000 jetta 1.8t that i need some answers for. When i bought it the check engine light was on for the upstream 02 sensor, i changed both of them and it ran fine for a while. Now all of a sudden this weekend my check engine light started blinking and when i scan it cylinder 1 misfire comes up. Also all of a sudden the car has a very lumpy idle and it has a signifigant lack of power also it takes forever to rev up going through the gears. So far i have replace the plugs with denso irridium plugs, changed the fuel pressure regulator and hose for it, i changed the fuel filter also. I have no idea what the heck the problem could be, any help to guide me in the right direction would be greatly appreciated. If it helps the car has a turbo back exhaust, an apr cold air intake and was tuned by ap tuning. I'm not really sure the guy i bought it from knew what he was doing when he put in the intake because it doesn't look right to me but i want to fix the first problem then go through the rest of the car.