You did not say if 4 or 6 cylinder but here is what my service manual has 4cyl Champion RC12LYC .033-.038/ 6 cyl carb Champion RFN14LY 6 cyl fuel injected Champion RC9YC both 6 cyl gap .033-.038
.034
0.35
.045.
.312 centimeters
0.9 mm / .035 inch owners manual
.044
Do you need a new spark plug??
That's not really what's going on. The coil makes the spark, the distributor distributes the spark to the correct plug. If the distributor is not in the correct position, the spark does not go to the correct plug, or goes to the correct plug at the wrong time.
.035 is the correct gap for your Wrangler's spark plugs. That gap is correct for at least up to 2006 and likely for 2007-2009 as well.
The recommended spark plug gap for a 1987 Volvo (all models) is .028"
mine is set at .040
correct part for js45a spark plug and filter