So i have a top swapped impala with speed daddy headers installed. Recently (well the past 4 months) I've been seeing the rpm needle bounce and the engine revving by itself when I'm in park or stopped at a stop light. I've changed plug wires... Today I got curious and took a look under the car. I'm not a exhaust expert but is this a exhaust leak? And could a exhaust leak cause what I'm experiencing?
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