1999 intrigue GLS 3.5- Runs rough. The guy I got it from was told the cat convert was bad so he gutted it. Still runs rough. I took it to Autozone and the codes read "bad cranshaft position sensor" and "multiple cyl misfire". I pulled the sensor and the wires have been very hot and were bare at the plug. Some may have been touching each other. I repair the wires as best I could and retried it. Still bad. I purchased a new sensor, still bad. I now have the plugs out and tested the compression. All are above 120 but the rear three are around 140-150. I am goingto change the plugs and little rubber boots. Is there something else that can cause the rough running, high idle then drops to almost nothing and sometimes dies, no power and must be held at high idle to drive?