The Oil filter is located on the opposite side of the engine from the oil plug. Look under the car from the side and locate the oil plug (middle of engine next to tranny pan). Once you see the oil plug, exactly on the other side of the engine (front of car) is the oil filter. You can't see it unless you crawl under the car. You will need to get the socket type oil wrench to get it off. Oil filters are suppose to be hand tight but some people get carried away. You will need to bring the front of the car up high enough to get under it to get to the filter. Remember safety and use good ramps.
the plug gap for 3.1 is 60,
the spark gap .060
1996 Chevrolet Impala SS 5.7L SFI OHV 8cylThe Spark Plug Gap.050 (In thousandths of an inch)
It is at the rear of the engine and has the plug wires coming out of it.
It is on the very bottom of the engine on the oil pan.
It is located on the bottom right hand side of the radiator.
On the passenger's side on the firewall just below where the evaporator would be.
The bottom inside corner of the radiator.
Copper: NGK 5858 (XR4); Iridium: NGK 7189 (XR41X).....
It is under the hood on the accumulator.
http://www.classiccarauto.com/impala/how_to/images/distributor.png
Plug should be at bottom or rear of radiator or disconnect the lower radiator hose