Stubborn Ford problems

:x I have an 87 ford mustang lx 2.3 litre engine and it runs very poorly and starts very poorly when it is warm outside or when the engine is warm what do you think the problem is
secondly there is a loud squeaking noise coming from my front end when I get in the car or whenit hits bumps and it is really loud when I turn what s vthat about
lastly I just put a decent stereo in my car and a brand new alternator but there is a whine through my speakers and I have switched the ground wire like 90 times and its still there and when my fan kicks in my headlight and dashlights dim and when my sub thumps the lights flicker
PLEEAASSEE help me im fed up with these problems already THANX :lol: :lol: