what does it mean when the computer code scans all 6 cylinder misfire? on 2000 Jeep Grand Cherokee

the scanner scans that all 1- 6 cylinders have a misfire and the p0300 -p0306 codes start to flash. the check engine light flashes at the same time when accelerate , but there nothing wrong with the car

Asked by for the 2000 Jeep Grand Cherokee
Possible wrong spark plugs need OEM. Coil module breaking down. Fuel Injection problem.
It won't run right with the wrong type of spark plugs!! That i know.
well for me it runs perfectly but the computer scanner say it indicates that ?