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IS your the 4.5 engine?
Okay thank yo for that, the correct gap on your 4.5 spark plugs is .032.
Im sorry I did not see the other question, when you say it will not fire do you mean it will crank but not start?
Okay so your saying you have no spark at the spark plugs?
Okay then that would be the next thing to check, pull a spark plug wire and hold it a 1/2 inch away from a good engine ground and crank the engine over and see if you are getting a nice blue spark out of it.
Okay please do, having the battery out and replacing it should not effect starting.
Squirting out like the engine is over fueling?
You can check the pressure at the fuel distributor with gauge teed in line or at cold start injector. See the steps in the link below. That would be the place to start.https://www.dropbox.com/s/d1nb5y51b2dyz1s/fuel%20distributor%20Sep%2018.pdf?dl=0