have a ford focus 2.0 sohc motor just rebuilt it but now having troubles taking off it chugs alot when giving gas and idles rough. once you get going 40 + it clears up once it does that you can stop at red light and almost cant feel car idle its so smooth.. But when I got on highway 85- 95 mph and it started to chug and check engine light came on and flashed till i dropped to about 70 mph then went out.. I feel it might be fuel filter/pump just want to see what you guys thought befor i start tearing tank out of car.. thanks