Yes it has helped me more than once, newer cars will set a misfire code the older ones we have top come up with our own tricks. It will isolate the problem cylinder and then you can eliminate from there, it may be a bad wire. I've seen new Belden wires last a year . They are on the inexpensive side and what most parts counter people sell because of low price but they can go bad quickly. Basically don't assume its not the wires, if the timing light test indicates something, throw a spare wire on and see if it changes
