Have you changed the plugs ?
Random misfires can be caused by many many things. Bad wires,bad plugs, vacuum leaks, stuck egr etc.
Not sure if these guys use wasted spark or not with the IM.
The front 3 cylinders are interesting however.
Do you hear/see the spark at the plugs or at the IM?
Have you removed the plugs and inspected them ?
How many miles on this ?
Could be a FI problem where the front 3 are not getting fuel as well.
When you take the plugs out you may want to check the compression on the front 3. Perhaps one of the VVT actuators took a crap and the valves are either stuck open or so retarded the spark event happens at the wrong time.
OK You are not getting what that guy is saying..It is only misfiring at idle..
it has good plugs it has good wires and the car has plenty of power on the freeway and r
oad driving, this misfire only seams to happen at idle. I have a 2007 Impala with one of these AFM motors and it is doing the same thing ..it throws a p0306 #6
cylinder misfire code. When the misfire occurs there is no lifter noise present, if a AFM lifter Was collapsed I would expect to hear it tapping... I assume if the injectors on that bank were starved for fuel I would have drive-ability issues ,this thing has loads of power when you floor it out in the field..
It seams to be getting bad data only at idle... And when you first start it it will purr like a kitten for several seconds until the computer does it's set up thing and then it takes over and causes the Misfire to start. And once in a while it will come to a stop light and not miss at all...Gonna put a compression tester on #6
later today This motor has less than 30,000 on new built motor .. Of course being a GM that does not mean much...
$6,661.00 for the rebuild in 2015.. Ouch! I got this car for $460.00
The original owner after buying this GM car new then proceeded to dump another 15,000 into it in tranny and motor replacement just gave up..
He was just not gonna take that damned thing to the shop ever again..
The giant stack of receipts from the mechanic shop was enough to sway Me to buy the car..
If you or anyone has an idea witch silly sensor is causing this misfire I would love any advice.. Throttle position sensor? If I get an AFM delete unit and plug it in will it start and just suddenly run smoothly... It won't smog in November If I can't get it to play nice and stop throwing itself into a misfire at idle....