Engine Stumbling Caramel Smell in 90-95 WD21 Pathfinders Posted June 21, 2019 SOLVED! At least I'm declaring it so. I tried replacing the coil. (Fortunately I have a 94 Pathfinder with a busted frame and a lot fewer miles as a parts donor). That made no difference. On the off chance that the fan wasn't cooling enough (even though temp gauge never got past half scale)I tried changing the fan clutch. Again, no joy. Considering SCJax2018's reply, I though maybe something on the distributor, like the pick up coil, is getting hot and degraded enough that it will soon fail, so I swapped it out. We've gotten hot weather again and I haven't had anymore stumbles or ignition problems even with the AC on to stress the cooling even more. Thanks to all for your helpful insight and suggestions, esp. SCJax2018 who got me pointed in the right direction. Thank you all very much!