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Q:

tune up on 1995 Chevrolet Blazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car hesitates when stop engine runs fine when accelerating
(1) Answer
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A vacuum leak, vacuum leak at the intake manifold, or ignition problem can cause an engine to idle rough. Hard to guess at what is wrong without being able to experience the problem fist hand and do some basic diagnostic tests.