2G Stock GSX missfire

[605jdm]

I just bought my gsx and drove it home for about 5 hours then a few days later the check engine light came on and came up as a missfire on cylinder one and I could hear it too. I got new heat 7 spark plugs and ngk wires and checked the spark that was all good but it's still miss firing. Please help I can't figure it out. Also my mpg dropped to 17mpg.

 

[JS4G63]

Before buying injectors (unless you know you're gonna want them as a supporting mod), it is really easy to test your ignition system. For the coils, super easy - all you need is an ohmmeter. It's fairly easy to test the transistor pack with an ohmmeter, a AA battery, and some way to attach the battery to the terminals without them popping off (like alligator clips, or a second set of hands).

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[605jdm]

Before buying injectors (unless you know you're gonna want them as a supporting mod), it is really easy to test your ignition system. For the coils, super easy - all you need is an ohmmeter. It's fairly easy to test the transistor pack with an ohmmeter, a AA battery, and some way to attach the battery to the terminals without them popping off (like alligator clips, or a second set of hands).]

I will try that out since i have all the stuff to do it. Also the the injectors were a mod i was getting anyway and i already have dsmlink to tune.

 

[605jdm]

Found out what the issue was... fuel pressure solenoid.