If it were bad fuel affecting fuel injectors, I'd speculate that if it were bad enough to affect three fuel injectors, it'd probably affect all.
While bad fuel could cause a problem, I'm going with I doubt so in this case, especially considering that there is a fuel filter and it serves all of the injectors.
I assume this is related to your previous post (<a href="http://mysporttrac.com/shared/msgboard9e.asp?BOARDNAME=MSG&VIEW=1344256&REPLYCOUNT=26" target="_blank">Runs ruff 2/3 power and idles ruff too</a>). Might want to keep the info. together in the same thread, so that others can find the problem and solution together.