[88Silver924S]

Agreed, good to see another 944 resurrected. As for your rough running can we assume you have checked/cleaned/replaced the basics such as distributor cap, rotor, ignition wires, and plugs?

How many miles are on the car? Do you have any maintenance history on the car?

Vacuum leaks can also cause roughness. With so much oil in the TPS your vacuum lines may need to be removed, flushed clean and reinstalled with new connectors; the 4mm rubber "U" and "Y" connectors get cracked and leaky with age (Put "vacuum connectors" in the Pelican Parts search box).

With that much oil in the intake you may want to take off the intake manifold and clean it out (mouse crap?). It is pretty easy to do and makes replacing the Air-Oil Separator o-rings easier as well as accessing all the rubber hoses. The injectors may be gummed up and need cleaning.

I recommend a brake fluid flush before driving much if it has been that neglected. If you don't have a power bleeder just "gravity bleed", it takes time but works very well (don't forget the clutch slave). Also antifreeze flush (including pulling the engine block drain plug) and of course an oil change. If the gas you are running on is several years old you may want to put some fresh gas in it and save that years-old gas for the lawn mower.

Good luck and have fun.