What could cause my car to act like it is out of gas only when it warms up?

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Check engine light flashing then steady. Checked code got p305 miss-fire detected om cylinder number 5. Replaced all 6 spark plugs and coil on cylinder number 5. Now check engine light went off then came back on. when cold the car runs fine but when it warms up acts like it is out of gas if you depress the gas peddle like you are going to speed up. It idles rough and also nocks.