I replaced the spark plugs, gaped at .35, replaced wiring, took each wire and replaced from the one I replace so the firing order should be correct, replaced the cap and rotor. The had been running before I did this. Now when I try to start the engine,it will only crank over, it acts like it having a hard time cranking over. I checked the spark, I did it by using a old spark plug and battery cable to the spark plug and neg on the battery, it showed there was a spark getting to the plug. Also checked it from the coil. The has gas in it. Got any ideas

If the engine is balking or kicking back while you are cranking it over, chances are you may still have gotten the wires on the cap wrong. You may have the correct order but started in the wrong spot.
Take a drinking straw and put it into the #1 plug hole (don't let it fall in) and rotate the engine by hand 'till the timing mark on the front pulley lines up with the "0" on the timing scale and the straw is at it's highest position. Look at the rotor. it should be pointing roughly at the R/F headlight. Mark the position with a crayon etc on the outside of the housing and replace the cap. That is the #1 plug wire position...the remainder of the wires are installed in the same direction the rotor turns...153624 or 18436572 (if 8cyl). If the rotor points 180 degrees away from where I said, turn the engine one more revolution.