Revs high on idle
Hi folks, got a slight issue, I’ve fitted a straight through exhaust on my vtr with a 3”back box, ever since then when the engines cold it idles at just over 1000rpm, but when I set off driving really slowly around 5-10mph it gets carried away with its self an starts reving just over 2000rpm buy it’s self, once the engine is warm it’s fine ticks over under 1000rpm, any help would be much appreciated cheers
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