Agree with the others. Plugs and wires are # 1 cause of grief. Suggest Champion platinum (for non-turbo) and Crane wires from RaceAndStreet.com.
That'll probably cure the engine grief.
As for brakes - can you tell if sound is from front or rear? If front, suggest Raybestos ceramic pads (RockAuto.com) and the best rotors that NAPA sells. You'll also have better brakes and no dust!
If it's the rears, and you have drums, suggest better drums - NAPA.
As to thunk from rear - back car up on ramps and look - check shock mounting points for bad rubber bushings, and all other connections for bad rubber bushings.
What year? How many miles?
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\'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler, E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5\", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in \'02 Silver Touring Edition w/87,000 miles
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