P0305 - have replaced the coil pack multiple times and still get the code? other possible causes

Question

I replaced all the coil packs recently. They have popped misfire codes in the past and every tech I have talked to recommended the coil packs to be changed. I still get this 1 misfire constantly. I have had compression checked and no problem detected. Changed my fuel filter, no change. Any other possibilities to look into?

Answer 1

How the connection  to the coil ? and the injector? Check the connection to the coil and injector, by pulling on the harness if the  connection comes out you can be sure the repeated misfire is from a failed locking tab, If the locking tabs are the fault you need to be creative with zip ties

 Here at the ignition coil pull up on the harness from the ignition coil if it readily comes out this locking tab failed and will cause a misfire on that cylinder

 

 Here on the injector check that pull up from the harness area if it readily comes out you can be sure the misfire is from a failed locking tab.