New member with a P0300 code question

[Irishfan42058]

I have a P0300 code and wanted to know if it is always the plugs or if it could be the boots or coil packs? I've changed the plugs and boots and still have a bad misfire. I've double checked that the boots were seated good. The plugs I used are the SafeLite Platinum. I also cleaned the TB and disconnect battery to reset.

 

[The_Roadie]

Start by changing the plugs to Delco 41-103.

 

[Irishfan42058]

Thanks Roadie I'll give it a try ASAP.

 

[CaptainXL]

Thanks Roadie I'll give it a try ASAP.

Additionally have the fuel and air filters been changed? How is the fuel pressure?

If those dont fix it then check the battery connections for corrosion and use a vacuum gauge to check for vacuum leaks.