Weak idle

Ok, my 1993 BMW 325is 5spd with about 112,000 miles is acting odd. First, it has a weak idle. It is at about 600 rpms in park and the exhaust is making the odd sort of bubbling rumble. Also when I am driving it isn't pushing as hard as it used to. My fuel effenciency has also dropped because it is taking more to keep a steady 55mph. It is wierd, I started my car after school today and it felt normal. I turned off the car for about 10 minutes and when I started it "blub, blub, blub..." <---(the car). ARGH!!! WTF?! Sorry about that, but this is really annoying. Please somebody assist! Thanky!

Help please!

it could be many things.. I would start with the spark plugs.. do not use Platinum...

Yeah, the spark plugs was my first guess. Do you think that it my be the fuel injectors? Forgive me if I am way off, but I am new to cars! lol

I would just add a fuel injector cleaner to the gas.. I wouldn't get into changing any of that yet..

could be a cracked head or head gasket