Yes it can cause erratic shifting. But not an engine miss fire. You need to find out why the engine is missing and running bad and when you fix that problem then I'm sure the transmission will start working and shifting correctly.
misfire
Not enough information. What are the symptoms? No spark, Misfire?
try changing the cap and rotor
Trouble code P0306 means:Cylinder 6 misfire detected
change the fuel pressure regulator ,i had the same problem on my silverado 2000. that fixed the misfire.
Normally a flashing check engine light means you have a misfire. Do not ignore this as an engine misfire will damage the O2 sensor and the catalytic converter which are very expensive to replace. Have this repaired immediately.
It's not a misfire, it's torque converter shudder, and sometimes it can be fixed with a fluid change or a chemical additive.
Misfire and O2 sensor erratic voltage. It can be many things. Don't throw parts at the problem. Take it to a professional.
this could be a bad plugwire or sparkplug or a bad coil for cylinder 7.
fuel injecters bad
Check Coli, an wires attached to coli, coli my not be getting enough juice
Driver's side head front to rear is 1-3-5-7 cylinders. The other head front to rear is 2-4-6-8 cylinders.