some weird problems

first problem is on start up, for a split second as the car revs up theres a weird rattle noise,as soon as the rpms come back down its fine

second while im driving it sound like a tractor trailor, idk if its the tires but it sounds like i have a flat it wines bad and increases with speed
 
Have you though about a wheel bearing? I've seen it in the past, you think it's something wrong with the tires but it is a messed up bearing....
 
im having this same type of problem. ive diagnosed it to my altinator going out. leaves a funny smell + has a whine sound to it until the motor "warms" up for a couple minutes.

Taking mine to mazda as its covered under warranty still...... autozone said the altinator is bad
 
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