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oil leak and poor gas milage
yes
A bad EGR valve in a 2000 Saturn can have several symptoms. The EGR valve can cause misfires, the valve can cause vacuum leak style problems. There could also be an engine knock.
Bad egr valve or a gummed up throttle plate or a bad idle speed motor,also check forbroken hoses causing a vacuum leak
Bad engine seal? Bad oil filter? Leaking valve cover gasket?
If the leak is bad enough i believe it can but i would check your valve cover gasket first.
A bad spark plug, a bad spark plug wire, a bad distributor cap, a bad rotor, a bad fuel injector, the firing order is mixed up, a bad valve or a vacuum leak could cause your rough idle.
the valve cover gasket is bad, or the valve cover is loose
Low fuel pressure, bad IAC valve, vacuum leak, bad injector(s). You also need to check the EGR valve.
Can be engine miss cause by bad spark plug or plug wire. Can also be a vacuum leak, or a broken motor mount. A burnt valve is also possible.
The most likely cause of a ticking sound in a motor is a bad timing belt. A valve out of time can also cause a ticking sound.
Check your motor mounts and what your at it check trans mounts.