problem: cylinders 2 4 6 8 ar not working on my lS6
spark plug wires.. good
plugs.. some burnt lookin due to backfires
background: ok i installed my ls6 into my 93 z. using painless performance harness.. the engine was working perfect .. then i had to drop the engine again to install diff rack and pinion.. put everything back.. then i got a back fire on cyl 6 and 8. switched plugs and wires to see if prob moved .. nothin..checked fuel.. spark.. compression.. all good.. then went o t disconnect injectors 2 4 6 8 and started car... started perfect of course only now with 4 cyl.. then reverse to the "bad" side... car wouldnt turn over..now half the engine dont work WTF!!!!... went to diagnose..i disconnected O2 to see if how it ran in both close and open loop.. same ****.. so now im down to wireing.. or ECM.. my ECM was flashed at G Force..but everything worked before so im not blamming them.. its an 02 ls6 timing should be good. but now im a 4 cyl .. i hate hondas.. some one GET ME BACK TO V8!!!!!!!!!!!!!!!!!!!!