Why does acid relux cause heart palpitations and skipped heart beats? Thanks

Heart as an organ. The heart is a sensitive organ and as such likes a certain mileu. Acid reflux (heart burn) is not a comfortable condition with acid in an otherwise alkaline mileu (esophagus), hence can cause GI pain and/or masquerade as chest pain. This perturbs the heart and has been associated with atrial fibrillation and/or simple extra beats. This is the explanation that is believed presently.
Vagal stimulation. Acid reflux can cause inflammation of the esophagus which can stimulate the vagus nerve which is situated nearby. Activation of the vagus nerve can cause many types of symptoms related to the stomach, heart, lungs, diaphragm, ears, tongue and vocal cords.