Engine sputtering

Hi,

Engine misfires at all engine speeds? problem can be spark related, fuel related ,engine compression or vacuum leak. as a first step we must detect which cylinder is the cause of the problem.
Start the engine remove the spark plug wire for each cylinder one by one if engine speed drops vibration increase then that cylinder is working properly, if no change in engine speed when removing the spark plug wire means that cylinder is the cause of the problem.
check the link below how to fix misfire.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
https://www.2carpros.com/articles/engine-hesitates

Thank you.