I am having this problem that the 4 ignition coils are not working I have tride other coil pack that are working still the same problem..an the other side is working the injectors are working but I think theres no power for the other side any body knows what can cause this sometimes it works but its really frustrating thanks....? An is an 02 silverado

 

trying to work out the same thing on my 09 ... seems to die on the drivers side under boost ... just the drivers side. im swaping my harness this weekend ... i think when the truck was towed and the transmission was spun in a circle ( no engine at time of tow) a wire was stretched

 

Check your grounds on the back of the head.