Loud ticking... but it still runs (albeit with little power)

[HeavyDuty]

my first thought was simply turn up the radio that usually fixs most loud noises...my second thought was remove the coil pack and reinstall it see if that makes any diff, mine use to do this...what year is it ? And def don't drive it until you figured it out...if it jumped time your repair bill is just going to get bigger...