I need a root canal in top right bicuspid. Its sensitive to eat on that side bc of the tooth. Pull, or save it? Would other teeth shift into the spot?

Save it. Other teeth may drift into the defect, but will not be straight. Food trap will cause periodontal problems in the long run. It will cost more to replace it than fix it.
See Endodontist. Endodontists are dentists who specialize in saving teeth, and have at least 2-3 years of advanced training in root canals. They are experts at diagnosing tooth pain and use advanced special equipment to treat patients efficiently and comfortably.