FTO AUSTRALIA

I've had my FTO for a little over 6 months and I find it has become quite sluggish. Last week I took the FTO on a 90KM trip to find about 30K's out from the destination the car started surging and struggling to climb the revs. So I am looking to buy the parts needed for a major service.

Spark Plugs, Injectors, Spark Plug Leads, Fuel Pump, New Oil, etc. Timing belt has already been done, so has water pump, anything else I missed?

For Spark I'm thinking Iridium NGK's (NGK BKR7EKC-N-11), Fuel Pump I read somewhere on this forum about a Walbro High Flow Fuel Pump?

What injectors do I go for? and Spark Plug leads? and anything else I missed?

Dude - if its not broken, dont fix it.
You wont need new injectors, or a fuel pump - just chuck some injector cleaner in and youll be fine.
Personally i go for the iridiums - saves the hassle of changing the rears more often - up to your budget really.
You wont really need new leads either unless they're rooted, which you will know about if they were.
Change the plugs, fuel filter, oil, oil filter, change the air filter, possibly change the PS belt if its starting to fray etc, flush out the radiator, change the brake fluid, PS fluid, trans oil and chuck some injector cleaner in there and it'll be right.
Take it to a mechanic and get it up on a hoist for inspection, maybe get him to do a compression test while hes there.
De-grease the engine and check it again after a few days for leaks.
Beyond the above, there's isn't anything else you will need to do for a service.

check TPS.

Sounds fuel related.

It only does this when I go for long drives on the highway, I only fill her up with premium too so yeah. What exactly do I check with the TPS? and how can I tell if it is buggered or just needs a clean?