Serious problem please help asap

[Suby Fan]

ok I'm going to ask the obvious question that no one bothered to ask.... is your check engine light on? I'm not sure it could be a bad cam angle senor usually the car wont start then.. its not a MAF the other symptoms don't line up (the super hot exhaust). it does sound like a clogged cat, if you can remove it with out any trouble then try that, but removing old exhaust systems is never easy. You can see if your car is still runs rough after you remove the exhaust. Also since other people have mentioned the timing belt as a possibility, and I agree a timing belt being off by a tooth would cause a horrible running engine and a extreme lack of power you can also remove the timing cover on the drivers side and check the condition of the timing belt and see if its still timed correctly by lining up the 1 cylinder to TDC of the intake stroke

good luck