Rough idle

Good afternoon,

Are there any codes set?

I would start with a compression test to be sure there is no cylinder damage.

https://www.2carpros.com/articles/how-to-test-engine-compression

You have covered the basics so we need to move further into checks.

https://www.2carpros.com/articles/engine-surges

Roy

I'm on the same page with Roy! Start with a compression test to make the base engine is in good shape. On semi-rare occasions the roller follower will fall off or a valve spring will break on a particular cylinder and have you chasing your tail for quite a while! That's where the codes will come in handy to identify a possible cylinder, then go from there.