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There is a possibility that you have a bad oil leak some where. Check valve covers, oil pan Etc, Good-Day! The sound you hear from engine, is because there is little oil getting to the tappets on engine for the valves. Sounds like the oil is running down on hot exhaust manifold, and smoking.That is the smell. Have it checked by a mechanic to find cause. Of oil leak!
Try putting a fuel pressure gauge on the injector fuel rail. Start the engine then turn it off, the pressure should hold steady not drop to zero. If it drops you have a bad injector leaking fuel into the engine. Also smell the oil to see if it smells like gas.
Chances are that the sending unit has a problem. Could also be a loose wire on it. Only way to test is to put a mechanical gauge on the engine and read actual pressure, or, just replace the sender and see if it helps. No noises from the engine is a good sign. If you had any tapping or knocking, putting a mechanical gauge on there would pretty much be mandatory.
Is it a sweet smell or a burnt oil smell? If you are having fluctuation water temps then I would look into the cooling system. That would not explain running rough though. Check your plugs, wires coil pack and fuel pressure.
Intake, combustion, exhaust system is supposed to be separate from lubrication system. You have a breakdown somewhere in that separation evidenced by gas smell in oil and oil coming through exhaust. Possibly head gasket or piston ring. Take it back to the folks who rebuilt it and ask them about it.
Any smoke from the back end? Did you check the oil level? Have you added oil recently? Its possible it might have been over filled. (which can be worse than underfilled) Also, open the radiator cap and check for white gunge. If its there you have a blown oil seal somewhere which is leaking into the coolant. Obviously, also check to see if you enough oil in there first.
It could just be the smell of anti-freeze that was spilled onto the exhaust or is sitting in one of the many little "pool"s on the top of the motor. Does it have a sickeningly sweet smell - like molasses? If so, that is most likely the problem . You can try hosing (very light pressure here!) off the engine compartment to rinse off any that has spilled. If you do this and still have this problem - I would check for leaks - both while the car has been running for 10 minutes or so, and also AFTER it has been shut off after running for the same amount of time.
That can be something wrong with the oil , how long time since you change oil and filter on the transmisjon. A other fault could bee the clutch ore brake band inside the transmisjon. If you smell at the oil , when you tacke up the oil stick , the color on the oil shall bee red , if the color been brown and the smell are smell of burning , the are something wrong with the clutch.