Hi,
I have a 2009 chevy suburban 5.3L LC9 engine, no AFM system.
I am getting a constant misfire on number 6 P0306 DTC.

So far:
- Swapped , coil, plug, plug wire and injector from #1 to #6.
- Checked good spark
- Compression 150# (getting about the same on other cylinders)
- NOID light on #6 injector, checked ok.
- Using Tech2, did an injector balance test, #6 similar to all other injectors. Good pulse and press drop similar to all others.
- Checked for collapse lifter and lifters checked ok.
- Did a leakdown test on #6 (and #1 for comparaison), no leak on #6.

Still misfiring continiously on #6. ????

What else can I do? I am at a complete loss...

Thank you.