Correct gap is .045 for the 3.1 engine.
The spark plug gap for a 1998 Chevy Lumina (with 3.1L or 3.8L engine) is .060".
.060
gap is .060
Not tightened properly? Threades stripped?
060 is the gap
.035
0.035 in.
0.045"
what is the spark plug gap for a 98 Chevy lumina sedan 3.1Liter engine
third one in the back, closest to the drivers side
rear left facing front of vehicle
.045 spark plug gap