2000 DX hatchback 260,000km. It has a misfire. It was misfiring last spring so I replaced the plug leads, cap & rotor and the misfire went away. The car only gets driven 4-500km per month so perhaps 3000km since then. It now misfires again. If I creep up on the throttle it will accelerate slowly without misfiring. If I drive normally it misfires under load. If I drive with the RPMs around 4000 it either doesn't misfire or it's spinning too fast to notice. What should I look at next assuming the replaced parts are not crap?