Where is a ignition module in a 1988 Acura Legend?

The PGM-FI unit is located under carpet at the passenger side. It covered by frame. Good luck. The ignition control module of any late model Honda/Acura product is always the PGMFI computer, which controls all fuel delivery and ignition timing coordination. Now, if you have a problem, that is ignition related, first replace the plugs, then the wires, and shortly after the ign coil itself. That's how you approach a Honda ign prob.