Linking R and intrusive R are sandhi phenomena (when the form of a word changes as a result of its position in an utterance) wherein a rhotic consonant (r-like sound) is pronounced between two consecutive vowels with the purpose of avoiding a hiatus, that would otherwise occur in the expressions, such as ‘tuner amp,’ although in isolation ‘tuner’ is pronounced the same as ‘tuna’ in non-rhotic varieties of English (those that skip some r sounds).
These phenomena occur in many of these dialects, such as those in most of England and Wales, parts of the United States, and all of the Anglophone societies of the southern hemisphere, with the exception of South Africa. In these varieties, /r/ is pronounced only when it is immediately followed by a vowel.
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The Daily Omnivore 