anyone have this problem?.. misfired one time and almost died, got a p0300 .. cleared it with my obd..so i changed plugs, new egr, and threw a bottle of chevron fuel system cleaner.. i notice when i hold the throttle at about 1800 rpm it still feels like it has a slight misfires, but runs fine when you just drive normal threw the gears and idles fine .. and does not throw a code though.. is it because it does it misfire enough to throw a code? trucks run fine unless you really look for the misfire and try to old 1800 rpm.. anyone ever had this issue?