chm2001z

I have a torquer3 cam and prc heads. It has lost a lot of power and last time it did this it was the spark plug wires. I changed the wires and still noticed the power loss. I was trying to tell which cylinder was not firing so I tried pulling the plug wires off one by one but I couldn't tell a difference in idle or revving. Is there any other way to tell if the cylinder is firing or if the coil is bad? I have ordered another set of wires but would like any advice anyone could give.