So a few days ago my car was like breakin up at around 4k rpms. I figured it was my spark plugs, because i havent changed them in a while(they ended up being burnt up n old). Once i changed them everything ran fine. But now it started doing the same thing again. I jus went to look at the spark plugs and they're really black and it has been less than 1k miles. What would cause this?
I used NGK plugs before and they lasted me forever. Right now i have in BOSCH plugs because i couldnt get the ngk ones gapped right.

Car- Honda civic w/ B16
Problem- Spark plugs went bad real quick.. WHY?

thanks n reps for help