Hyundai Repair: Classic Misfire 2.0 l, spark plug wire, crank sensor

Question
Classic misfire symptoms - Idles great ... after it warms up and ANY pull at all and it begins to misfire - ALOT!
New plugs. Some time ago when a bad crank sensor was reported it also reported "#2 Misfire" .  Not sure if that is relevant anymore.  There is NO check Eng light so I am assuming that how ever OBD II detects a misfire it isn't sensing one now.  
Regards,
BOB

Answer
Presuming you indeed have a misfire under load, you should begin by checking the secondary ignition components (plugs, wires, coil).  Most misfires are causes by these components.

Visually inspect your spark plugs.  Check for carbon-tracking on the porcelain.  If it's present, you'll need to replace at least that plug and wire.  If you can determine which cylinder is misfiring, swap the spark plug with the one two cylinders away.  If the misfire moves, you'll know it's the plug.  If it stays on the same cylinder, you'll know it isn't.

With the engine off and the spark plugs installed, remove each plug wire from the plug and then rest it back on top of the plug without clipping in place.  Start the engine.  One at a time, gradually lift the wire off the plug.  Spark should come out of the end of the wire and jump to the plug or the spark plug tube.  If the spark comes out of the side of the tube insert or the wire, the wire is defective.  If you have trouble getting spark out of the wire, that's an indication that the coil may be defective.

If you cannot produce a failure with the above, you can try misting the spark plug wire and coil area with water from a spray bottle.  If you see any arcing, that'll be the area where the problem is occurring.