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From the timing belt to the transmission the fireing orders are 1234 One and three fired the same time 2 and 4 fire the same time. Pull all the plugs for the spark plug on them and lay them across the top of the motor with plugs in them you can see which ones fire at what time. The spark plugs need to be touching a grounded part of the engine to fire. This also will help you find out if you have bad wires.
Here is the firing order diagram for that vehicle, and if the ignition wires are not crossed then one of the spark plugs might have been damaged while installing it and the spark plug gap closed on one of the spark plugs, or one of the ignition wires (spark plug wires) has been damaged, and if those wires are over 5 years old then you should replace them. I hope that this helps you to solve your problem.
Visit your local parts store and purchase a set of ND or NGK plugs. DO NOT let them talk you into platinum plugs, "triple fire" plugs, Bosch, or anything else! Japanese plugs are made to a different standard than others, and anything other than ND or NGK will not give you top performance or mileage. To do the change, you'll need a 3/8-inch socket wrench and a spark plug socket. You do NOT need a torque wrench. Back the plugs out one at a time, and replace each one before moving on to the next. . Note the resistance when you back the plugs off, and tighten each with the approximate force that it took to remove them. If your plug wires are original you might want to replace them as well. Try to get a set of Japanese wires, but good quality American wires will do. Be sure to replace/connect the wires one at a time so you don't cross-connect anything.
you might of crossed some wires, go to auto zone web site there you can see a diagram of the firing order, and check to see if wires are in the right place, if truck ran before you replaced the plugs then its got to be crossed wires, hope this is helpful.
you shouldnt need a diagram there should be numbers on the tension leads coming from the distibutor and numbers on the engine block near the spark plugs just match the numbers and the leads are usually different lengths, also the distibutor cap has to be in the correct position if not it is basically the same as crossing the wires and putting them in the wrong spot which will stuff up the firing order