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The brake fluid change can improve brake pedal feel significantly.

Use premium full synthetic oil for best VVT performance. That makes a big difference IMHO.

The spark plugs tend to wear quickly on these, killing the coil pack. So at least replace the spark plugs which is a very easy job indeed.

Clean the throttle body / butterfly. Clean the MAF (use special cleaner only). Get an air filter for the engine.

I would change the cabin air filter. Better AC air flow for the summer. Plus, if a clogged filter kills the fan resistor pack, that is very painful to remove.

The drop links are early failure items and easy to change / cheap; the metal ones are higher performance IMO.

If you are looking at suspension work, the outer tie rod ends and strut mounts wear rather quickly. And springs tend to break, so those items would be important changes.

If the timing belt has not been replaced, consider a full kit. Replace the accessory belt whilst there.
 

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Oppps. All European z18xer engines might not have a MAF. It is on top of air intake just before the throttle body for North American models. Forgot about that.

Didn't know GM took that Saab technology but knew Saab had similar engines. My Saab mechanic was familiar with the z18xer.
 
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