Review on Vplus Spark Nickel Copper Replaces by Billy Reeves

I didn't know what to expect from a set of 8 spark plugs for less than $20, but cheated . A few days ago, the 2012 Ford Econoline XLT E-350 engine suddenly started idling rough; and 20 minutes later the check engine light came on. It had over 147,000 miles on it so that was to be expected. The engine now runs normally. But one thing: I changed all eight spark plugs and coils. These were rolls for less than $40. My premise was why change only one? And I didn't know if the spark plug or the coil was bad. Also, if one of them fails now, something else should fail soon, so why bother doing it again later when I can change them all right away. I did the same to the headlights when the right one went out; and now I can look at the street without worry.