1999 Infiniti I30 Q&A

1999 Infiniti I30 Question: Is it normal for fuel injectors to go bad, one after another in about 3 weeks?

Took the car to mechanic about 3 weeks with knock sensor and injector error codes. He replace #2 injector (stuck open). About a week or so later, same error codes and bad miss reappeared. Mechanic replaced #1 injector. A week later got car back and within less than 10 miles it all started again. What is causing these injectors to go bad one after another??? -
Answer 1
poss bad fuel or old age. -
Answer 2
Best to replace them all at the same time!! Same age and mileage on all of the old ones. Usually cheaper also. -