If extensive GI workup showed no structual problems or ca of esophagus (only esophageal dysmotility) is chonic sore throat & chest 2 yrs later gi?

Maybe. Your sore throat could certainly be a GI cause. I would recommend that you undergo evaluation for acid reflux to see if that is a cause for your sore throat. Esophageal dysmotility could contribute as well, although it depends on what kind of dysmotility you have (there are many).
Sore throat. Stomach acid, post nasal drip, allergies, smoking, dry weather are common causes of sore throat.