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Still sounds off. Take the #1 spark plug out, put your finger in the hole and have someone bump the starter around. As soon as you feel pressure, or a whoof sound (air coming out the hole), stop cranking. Look at your timing scale on the crankshaft pulley: You should be very close to the zero scale on the pointer. Put a socket and wrench on the crank pulley if needed to turn the crank on around (clockwise) until the notch or line on the pulley is right with the zero mark on the pointer scale. Now you are at top dead center of the compression stroke on #1. Take off the distributor cap. The rotor should be pointing directly to the #1 spark plug wire tower. Now that you have #1, follow the firing order around in the direction the rotor turns to check if each of your plug wires are in the right place. Firing order should be stamped on the intake manifold. If a 350 engine, firing order is 1-8-4-3-6-5-7-2. You might need to check that, only going by memory from couple days ago when I had to do this. The cylinders on the driver's side are 1-3-5-7, front to back. On the passenger side, cylinders are 2-4-6-8, front to back.
looking from the front of engine if its not a transverse engine(side-ways installed), the plugs on the drivers side from left frt to firewall are 1-3-5 and the passenger side from frt to firewall would be 2-4-6-
Check for any wiring pinch which might have occurred when the injector was replaced. The injector is driven directly by the computer, so it seems to point at the new computer as being faulty. (pulse signal is always 'on')
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