Guys - thanks for the responses.
Gerry - I plow snow with my Wrangler, and after plowing for an hour or so I start to get a stalling symptom, won't take the gas, surges from around 700 to 2000 rpm, acts like it isn't getting gas, then check engine light comes on. Let it sit turned off for about 10 min. then it starts and runs o.k. again.
It has done this about 5 times over the last 3 days, and now I sense a slight ongoing miss at driving speeds.
The engine code comes back as 12, 11, 11, 55. The 11 being intermitten camshaft or crankshaft sensor.
Yesterday I changed plugs, wires, cap and rotor. The plugs had burned the gap way to high, and needed replacement.
Any additional recommendations?? Any way to test the sensors? And where can I get the CPS for less? The $120 price was at autozone.
Thanks for additional help.