The spark plug gap in your 1999 Chevrolet suburban is dependent upon the type of engine. The standard engine spark plug gap is .011.
A person must leave the right size gap for the spark plugs when changing them. The 1999 Chevy Suburban has a spark plug gap of .060 inches.
.035
.045
The spark plug gap is listed in your owners manual and under the hood on a placard.
passenger side third spark plug back Driver side ?
0.060
Could be a faulty spark plug or spark plug wire.
which plug? oil, coolant, vacuum, hydrolic, or spark?
.60
Listed under the hood on a placard and in the owner's manual.
The spark plug gap for a GM vortec V6 is .060