Hello, Iam sorry for late reply, just back from holidays........resistor ends can only be check on machine unless you are lucky enough for the miss to start while mechanic is having a look. Mine was then checked and the offending one located... mine would only miss occasionaly and it would lose all power and miss very badly. It may be wise to replace all of the ends as they can break down and cause this type of probl;em. I have not had a miss in the car since replacing them. they are prone to break down after some time, they will do many thousands of Ks before trouble...... Best of luck with the problem. regards Graeme D.