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This is Dr. David
the sour taste can be from bad acid reflux coming up from your stomach
or it could be due to post nasal drip of mucus from your sinuses or nose dripping down the back of your throat.
or you could be having bad gingivitis infection of your gums which can cause bad breath and sour taste
or some combination of those causes
have you seen a dentist recently?
you need to see your doctor to see if you have acid reflux. you might need an upper endoscopy scope procedure down your esophagus to check for acid damage.
let me know if you have questions.