ignition

So i suddenly had issues with hard starting, then choking, bucking and stalling. So i get prepared to check my systems. I started down my check list: 1.) O2 sensors (check) 2.) Throttle Positioning Sensor (check) 3.) Crankshaft Position Sensor tested with a meter for continuity (open - check)...

93YJ 4.0 Ignition Issue. After installing 6 new spark plugs, the engine misses while idling but runs good on the road at normal speeds. Any ideas why?