Before you pull anything apart, try this.
Start engine, have appropriate wrench handy for injector nut, 11/16 or 17 I think.
With engine running, crack nut until you see
fuel spurting. Engine should lose
RPM.
If you do that and have no change...I would suspect the injector. If you have a good spare injector, pop it in and see if there is any change.....Do not touch the tip of the injector with your fingers or let it bounce off the
deck (HAHA)