Jstoked

So my problem is that the motor is only running on 4 cylinders.
What has been done so far.
Replaced the ecu, replaced the cam position sensors ( with used ones )
Did a whole tune up Plugs, wires, caps, and rotors.
Replaced the wire harness to the cam sensors, crank sensor, right coil pack
So it quite running on me (fouled out the 4 cylinders) so pulled all the spark plugs out today to check them out. If looking head on at the motor all the right side plugs are firing but left side still look like i took them out of the box.like no fire at all is getting to that side. Any ideas whats up with this

PureDrifter

iTrader: (10)

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dead ignition coil or wire to ignition coil for that bank.

deanshark

What year is your LS, how many miles? Need to make it easier for us to diagnose the symptoms. It also helps the people who actually do search for the answers to thier problems in the future.

Is there fuel getting to the even numbered cylinders? (passenger side) I ask b/c 2 of the cylinders spark from each distributor. Smell the spark plugs, see if they smell like fuel? Check for spark at all 8 spark plugs. If one, or multiple, plugs are not sparking just follow it backwards to find out what is bad.

Extrudedco

Check for spark and fuel as people have said. If both are present, check compression.