neons HATE platinum plug with a passion, both my original 2.0L DOHC and the replacement 2.4 ran like absolute crap on them...dont think they would cause an injector failure, but they are bad enough to do weird things, get them out ASAP, put the stock plugs in and take it back, on a guess I would say your computer may be semi-fried(the injector drivers may be overworked) stock injectors? if not try putting the stock ones back in, but dont put it past those plugs to screw things up, IMO from experience...it is a possibility...although a remote one
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