Silverado classic 4.3 2wd

[Dar203]

I have change the computer,ignition coil,ignition module,rotor button,and dist.cap and it still will not start not getting any fire to plugs started out with a bad miss then would start and run for a short time now will not start get code po300 please help do not know what to do

 

[zora]

is the security light on?
what year?
did you check using a voltmeter or test light for power going to the distributor?

 

[Dar203]

Security light not on, it is a 2007 no I didn't check power to the distributor but I will thanks