engine misfires

It sounds like you have a vacuum leak or the engine needs to be tuned up. Lets start with the vacuum leak, here is a guide that will help you find the problem.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

and

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Please let us know what happens.

Cheers, Ken