It could be anything from a few bucks to thousands. It could just be that you need to replace your spark plugs or it could be something much, much deeper. I would start by checking the spark plugs, plug wires and distributor cap. From there it gets more in depth. Thank you for a positive rating but please let me know if you have additional questions before giving a poor rating. Thanks for using FixYa!
Depending on what is causing the misfires, the price can vary from $100 to 4k.
You need to give more info to get an acurrate price range.
P0300....Random/Multiple Cylinder Misfire Detected
ask local mechanic to have a look for you ,could just be a cold damp engine or snow blown under the bonnet
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