My 97 855R needs new spring seats, tie rod, control arm and likely struts. I also want to do some preventative engine stuff; the common tune up and PCV kits, even though I don't have any codes, engine issues or smoke in the dipstick.

I'd like to tackle one issue at a time, as I'm new to this. Generally, should the engine stuff take precedence over the suspension issues? If it's a question of preference, which would you do first?

 

Just my own opinion, but I believe you should tackle the suspension / steering related issues first.
Safety first is basically the thing.
Non urgent engine maintenance can take a back seat till you get the important safety matters seen to. (Your post implies that the engine has no issues currently)

 

This is correct. Just a few heater hoses I should replace, as well as the usual tranny fluid and coolant refreshes.

Suspension is what I am aching to do, but figured the engine should come first for reliability. But you're right, if there isn't an apparent reason to be concerned there, but there is elsewhere, I should hit the elsewhere first. Thanks.

 

Well, it depends on what is pending the most damage. A clogged up PCV system can blow a RMS, that will set you back over $900. It is also an in-expensive thing to deal with. Also a broken old spark plug can break and chip a valve. Where as a bad shock can be lived with as long as you are not racing around town.

Brakes are safety, struts can be driven safely no matter how bad they are.