1989 YJ, 4.2, carb. C2BBD carb.
finding parts this old and not from/made /or sold by jeep is never easy
google is the only hope, (outside of all forums, begging, and wise sure)
mine is in the dumps, soon as I saw it there, it hit the trash.
the stock parts work best. IMO.
cold air kits are hot air kits. it eats all the hot air off the radiator fan. and full of dirt too
mine has stock box and a front stock snorkel kit, on it, . and sucks clean fresh air from leading edge of the car.
it allows deep water (ford'ed) to not land on the filter too, and bend the crank shaft rods. (drive dead slow there)
the stock system was well designed. it is a fact.and filters of vast kinds/makes and types fit the stock box, even $$KN$$
YMMV, or your medium may vary
ive driven ,my jeeps now far over 500k miles. not once ice'd up and for 3 decades an avid skier(at K2 ),1988 up me.
my older cars were all manual chokes, or modified by me to do that. (61' c10 chevy first one done,, and draft notice in hand, dang.)
yes , the choke on the carb must be set leaner, at high altitudes or the bugger floods.
humid air at dew point is the cause of icing.
the top cure is cars with water (coolant) heated intake manifold that effectively roasts the carb.
seen below here is your loop (FSM real page)jeep
make real sure there is no cab heater
water valve here. or the path is blocked , to heat the carb. oK?
real path,below must not be blocked in any way ,shape or form.or bypassed as seen in say KEY WEST, no cab heater at all and bypassed it wrong
must flow water all the time, and 180f up thermostat, not it bad, not missing or below 180f ever. or those dang fail safe thrmostats end life stuck wide open. and ignored. of 7 years or older , time for a new themostat. try a USA STANT