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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I'm sure it is EGR. Can't think of any cars made from '80 on (don't remember when it became mandatory) that don't have an EGR valve. Go to www.autozone.com and see if they list one for your truck.