Unpopular opinion: pulling my injectors and sending them out for a $60 pop test beat buying new ones
Truck was smoking white at idle and had a miss I couldn't track down. Instead of throwing money at a whole new set I pulled all 8 and mailed them to a shop in Tulsa. Two came back bad, the rest were fine. Reinstalled with fresh copper washers and it cleared up in 2 days of driving. Anyone else test before replacing or do you just swap the whole set when one acts up?