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Hello there I have a major problem with my skyline I changed my spark plugs and now the car sounds like an wrx .. When you turn over the car it starts to shake the Motor just was requiring is this is a comment problem I am thinking of changing my coil packs but wondering if that's going to work and this is my first time owning a skyline so I need some help thanks people for your time in reading this

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One of your cylinders isn't firing. Start the car up and begin removing coilpack loom plugs, one at a time, to see if it makes a difference to the sound of the engine (i.e. running on 4 cylinders instead of 5). When you pull one off and it doesn't make a difference (i.e. still running on 5), that is the problem cylinder. Once you've sussed it out...just remove that coilpack and spark plug...then re-install...should fix whatever issue you have. Sounds like something wasn't connected back properly because it was working prior to the spark plug change.

Sounds similar to the issue I had last week and it turned out to be a dead Coil Pack.

Let the car idle and unplug one injector at a time. When you find an injector that you can unplug without changing the car's idle then you have found the cylinder with the issue. If for example, cylinder 3 isn't firing - swap coil pack 2 and 3 around. Run the same test as above. If the issue is now occurring with cylinder 2, you know it's the coil pack. If not, could be the injector.

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