I have a newly purchased 88' dodge 50 , 2.0 . I noticed the heater control doesn't seem to change much between defrost, floor, vent, etc. All fan speeds seem to work, but not much airflow felt. Lots of noise though. Is there a common problem with any of the heater control cables? or heater box flaps? It takes a while to defrost without the airflow.

Also idles rough, starts good cold...but once warm-Rough. I plan to look into it this weekend, just hoping for some good leads.

Thanks, John