I had the same thing happen with the 2.2L in my '96 half-truck. It turns out that the replacement injectors don't have the same flow ratings as the originals, so there will be constant misfire until you install a matched set. To you naysayers, send your set(s) of the
www.cruzinperformance.com to have them cleaned and flow-matched. The results will be enlightening. What a waste of money for me, since the replacements I installed were useless because they didn't match flow with anything else, new or old.