I recommend you install AC/Delco spark plugs. The exact model plug depends on your exact application. Any auto parts store can provide the correct model plug.
either its running to lean or you have a bad exhaust valuve
none a diesel does not have spark plugs it has glow plugs and depends on the engine and if its a 350 it has 8
Use the same spark plugs as you would with a distributor, but reset the gap to .020".
rs45ts
Ummmm......... I think you want to use spark plug wires.
Put the IROC up on jack stands and remove the spark plugs from under the engine.
20 ft lbs
There is not spark plugs in a diesel engine.
.050
call a mechanic
The 1991 350 cubic and Chevrolet engine spark plug gap is .027. Most spark plugs will come pre-gapped from the manufacturer.
That depends on which engine you have : The 4.6 L and 5.4 L - V8 engines have ( 8 spark plugs ) The 6.8 L - V10 engine has ( 10 spark plugs ) The diesel engine has ( 0 spark plugs )