P0304 Hyundai Sonata cylinder 4 misfire

P0304 Hyundai Sonata cylinder 4 misfire - These troubleshooting methods will work on many makes/models of cars/suvs. Learning this technique will save valuable time in diagnosing the actual cause of a misfire engine code (P030X). Some basic tools are needed but nothing super expensive or complicated to fix this. Enjoy and thanks for the support! Amazon Associates Earning Affiliate links to tools and parts used for this project: Innova Code Scanner - https://amzn.to/3ECeLmk Socket Set (10mm socket used) with extension - https://amzn.to/3ECsCch Spark Plug Socket - https://amzn.to/44UBIvM Sea Foam (3-pack treat all your vehicles while you are at it) - https://amzn.to/3sKQW9c Wix Air Filter - Use this link then filter for your make/model - https://amzn.to/3sT1a7L Coil Pack (not needed this time) Use this link then filter for your make/model - https://amzn.to/469C2I5 NGK Spark Plugs - Use this link then filter for your make/model - https://amzn.to/463FSmF Anti Seize Compound - https://amzn.to/3rdUNLO AIM Penetrating Lube - https://amzn.to/3U3jPW0 ** MERCH Site ** https://troysgarage.myspreadshop.com/ Send me stuff: Troy's Garage YouTube Channel 4956 West 6200 South - Box 235 Salt Lake City, UT 84118 Check me out in other places: Instagram:   / troysgarage   Chapters: 00:00 - Intro and Description of issue 00:41 - Scan for codes 02:03 - Pulling Coil Packs and Spark Plugs 03:29 - Reading Spark Plugs to diagnose 04:05 - Coil Pack troubleshooting technique 04:44 - Buying parts to repair 05:06 - Using a bore scope to see inside cylinders 06:28 - Installing new spark plugs 08:42 - Replacing Air Filter/cleaner 09:59 - Adding Sea Foam Fuel Treatment 11:03 - First Engine Start After Repairing 12:40 - Fixed and Outro