W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
Spark Plug: Testing and Inspection
Spark Plug Chart
1. Remove spark plugs, and inspect them for carbon deposits and damage. Ensure spark plug gap is 0.036 in. (0.90 mm).
2. If plugs are satisfactory, reinstall and check for a mechanical or fuel system problem.
3. If plugs are not satisfactory, clean or replace as necessary.
