New To The Stangnet!

So I have bought my first mustang! Shes an 06 gt! Has the screamin yellow paint scheme. Upgrades are 2011 wheels I believe, magnaflow axle backs, k&n air intake and sct tuner. Possibly other stuff not to sure. And she's a manual! Love it so far. The only thing I'm gagging problems with so far is a dirty throttle body I believe, the car idles really hard and will shut off sometimes when I shift into neutral, ive got some serious squeaking going on with I believe it's my rear shocks or brakes and when I go to flip on my high beams my headlights just shut off. So any info on these would be greatly appreciated!
 

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