This weekend I'll be replacing/performing

Oil change
Fuel pump
Fuel filter
Seafoam
Spark plugs

What's the best order to perform these in?

Also, I've been having cut out issues, car will die, just runs like **** in general. Completely intermittent though. It will be running fine and then start cutting in and out. I can't give it too much gas or it will die. It smells like lots of fuel and white smoke comes out of the exhaust. It sounds like it's not running on all cylinders (a Subaru). Then after a few minutes it will run fine.

It runs fine more often than not, and it seems that it's more likely to happen the morning after a night of rain. But it does happen at the end of a dry day. This is what prompted me to do all this maintenance at once actually.

Any other suggestions on what I should replace or work on this weekend?

EDIT: I have a 1JZ swap btw, essentially stock

 

Bad caps in your ECU.....you need a remanufatured ECU

 

That's what I was thinking at first, but I checked about 2 months ago and it was fine
I'll check it again