pull the coil pack off and take it to your local outo parts store. they can check it there. usually for no price. they do around here anyways. and if thats good, check the plug wire... make sure theres a good connection and it wouldnt be a bad thing to put some of that dielectric grease on the plug and the terminal on the coil pack. and if all that checks out then i'd start looking for a short in the wiring harness for the injector and check the connection to the injector and do like johnsongrass says and put the grease on the connection to the injector. and after that im stumped. unless you got a faulty injector which can happen but is unlikely... unless you bought ACCEL injectors which are junk. but anyways check that stuff and let me know if ya find anything.