Engine cranks but will not start

Iv taken the fuel rail off and whatched the injectors pulse. When you first start cranking and keep cranking with out stopping. All 4 pulse then 1, 3 and then 3 and 3 will keep pulsing. I replaced the cam sensor and still the same thing. I talked to someone about this and they found out that the injector driver is bad in the computer. Can this be flashed to fix the problem. Or does the computer have to be replaced?

Would you suspect the computer to be at fault? With the injectors mispulsing. Or could there be something else causeing this that I haben't replaced yet?

Could there be something else that would cause this issue? What circuit should I look in?

I do get voltage from all the injectore while cranking. I replaced the coil and get spark from all plugs too. I replaced the computer, I found one at a good price but still the same isssue. Something is activeing the asd relay I think. I can't seem to find out what is causing that. Do you know if there is something on the side of the crank shaft that the crank sensor uses to pick up location refference?

I have just thought about checking thwe timing again. I did a visual check it appeared to still be correct at the cams, there is an access cover that can be removed. I really couldn't check if the crank was lined up due to the timing cover being in the way of the mark on the sprocket. I am taking all of that apart to double check because if that is not the problem I am having the care towed to the dealer for more indepth diag. My questioon is, is it possable for the timing to be off on the intake cam by half a notch to cause the car not to start. And is it possable for the timming to be off a little bit but not enought to cause any problems to bend a valve or cause any internal damage. I have noticed the ideler pully is broken/worn out the belt is not sitting on it where it should be but is not off it. I was thinking that the hydrolic tensioner may not be putting proper tension on the tnsioner pully. And could have cause the intake cam to be off a little. I have turned the engine by hand and by key and felt no resistance or any noise to indicated internal damage I know the 420a engine is an interference engine.