I have an EXCELLENT running 98 Plymouth (rip) Neon, SOHC powered that I drag race and when I drive it after it has sat for a couple or more days there is a strong gas smell in the interior until it has been driven quite a distance. Could it be bad seals on the injectors. One shop that had it for another problem noticed the smell but could not find it. If it is driven every day there is no smell at all.