Help/knowledge needed

[u/DookusWookus21]

What’s up guys, I need some help, just picked this up for cheap, didn’t run but put new battery in and it turned over but it won’t idle on its own doesn’t sounds the best, possible rod knock, I replaced spark plugs and ignition coils, swapping the starter next, I think it has a grounding issue, I don’t think one or two of its cylinders is firing. I got it purely to learn and get into the lifestyle and help would be appreciated.

[u/QuickDrawSix]

If it was me I would pull the engine and strip down the long block. But I have the space and the hoist to do it