Car started acting up today. Got check engine light and had it checked at auto zone. Code was P0300 multiple misfire. So they recommended that I check the plugs and maybe change the coil pack. So I changed both the coil pack and sparkplugs. Engine was also running very rough this is why I had the car checked. What else can I do?
Stop wasting time at auto zone and throwing parts at it. Find a good repair shop and have it properly diagnosed and repaired.
Have you ever had a spark plug fail in your lifetime?Probablely never will.
Do you know how to test a coil pack? Did you test it?
A simple check of vacuum hoses or a loose air filter cover,loose gas cap an so on ,could be your part of your problems. e.g. something simple.
I would recommend spending the big bucks and getting the shop manuals,for all your vehicles,something no one wants to do. Then study your vehicles systems and eventually ,you may be doing your own repairs.
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