when i turn off my truck sumtimes it kinda has trouble turning off

[87GMC2WD]

i would agree with the hot plugs excpecially after a 400 mile run. is the truck running hot?

[infamouschevy]

well this is what i was thinking because it smells rich in gas i would say so i changed my fuel filter anyway after i changed my valve cover gasket and when i was doing all of this i saw that one of my spark plug wires was unplug at the distributor i turned my distributor cap slightly for the timing and it hasn't done it so far but when i go back to school again i guess will be the test run.