What is your question?
·
·
What is your question?
rough engine sound, vibrates hard at idle.
What makes this problem better or worse?
Error code 306
How long has your 1997 Cadillac DeVille had this problem?
three weeks
1 Reply
Hello, what testing has been performed to know that you need these parts replaced? A P0306 misfire could be due to plugs, wires, coil -- but it could be from engine compression, valve train issues or fuel delivery. If you are asking what tools you need to replace these components, you probably should be having a professional assist you with this. Or at the very least, obtain a repair manual or access to repair data. It's totally impossible to advise you via this forum - you have to be there and have experience to know what you need.