Hello I have a 03 monte carlo ss cylinder 2 and 5 aren't firing at all I switched coil packs around I replaced the coil packs spark plug wires fuel filter spark plugs also the control module and the computer and still nothing cylinder 2 and 5 have nothing I believe it's a electrical problem what should I do thanks

 

Which control modual and computer?

 

I put back in my old computer and the module is for the coil packs

 

I honestly dont know what's causing it

 

Did you have the old ignition control modual tested? Did you replace the coil befor or after the modual?