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why does engine light show #4 CYLINDER misfire 2days after replacement x4?

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I put a rebuilt engine and transmission in my car and engine light keeps coming on after spark plug and coil replaced. Has lost at least 20% of power.

Vehicle: '02 mustang gt convertable 4.6L

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P0304 Misfire number 4 cylinder

How the fuel injector of the number 4? Doing a leak down test on the cyclinder should be the next test to determine if there is a mechanical condition going on

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