Your symptoms (intermittent stuttering) may or may not have anything to do with the injectors. Do a search on "rough idle", "missing at idle" or something similar and you'll find some other possible causes. Do a "Search Title Only" search on the word "injector" and you'll find all kinds of DIY info, some good, some not. Use discretion.

It seems kind of pointless to spend $15 - $20 on having your injectors cleaned when you can buy brand new ones for $25.41 ea. from FastLane. If you're going to go to the trouble of pulling them out but don't want to spend the $$ to replace them all, have them tested only and simply replace the bad ones. Be sure to replace the seals on all of them, though. They're only $1.36 ea.

Gary