Sometimes after i drive home from work at night, I will stop at an intersection and my lights dim and my RPM's drop and jump back and forth between 450 and 500. Is it possible that my alternator is bad or have electronic problems?

ANYONE who has had the same problem, please help.

note:
I do NOT have any type of sound system, so that isn't it...

 

check if your battery is charged. if it is, it is the alternator. Case closed

 

How much will analternator cost me?

 

its a pretty good amount of money. I dont' know the exact quote

 

Used alternators on Ebay run not too much... here you go ( http://cgi.ebay.com/ebaymotors/ALTER...spagenameZWDVW ).

 

Thank you everyone for the help. Good news is I might have fixed the problem. There are about 4 or 5 vacuum hoses connected to the intake manifold (black with green, red, yellow or white strips; I think) and one was disconnected! I reconnected it and is seems to have fixed the problem for now but I will keep an eye out and keep you posted.

I hope this will be helpful to others.

 

Don't confuse electical problems with driveability, it will kill you every time.

 

The problem is solved!

the vacuum hose was throwing my Air/Fuel ratio off. this was causing it to dump too much fuel and basically bog down the engine. Everything is working great now and my car has never run better!

After further investigation, the case is now officially closed.

I hope this is helpful to other...