one thing that will be easier then pulling the plug wires off is to use a test light. connect the clip end to a ground(battery works fine) and then put the sharp end into the top of the plug wire on the distributer. it will be grounding out the wire and accomplishing the same thing as pulling the wire and you WILL NOT get shocked like i usually do. also it will be easier to tell if there is a change if you can put a load on the motor. on my truck and jeep it is real easy. all you have to do is get someone to put it in gear, hold the break and give it a little bit of gas. im not sure if you could have someone ease out the clutch a little bit until the motor has a load or not.....