Sounds like a similar issue to what I have on my ‘97 w/ 212k. It only happens when warmed up and started noticing at stop signs and parking.
Did you find out what it was? Coil packs?
Hey CajunRunner - I am buying a ‘97 with this “factory” Hella kit and want to put some yellow LED fog lamps in if possible. Do you know if the bulb is the standard H3 for these?