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I have replaced the engine in my 92 toyota 4x4 with a remanufactered engine from atk engines. It has a fairly rough idle but smooths right out with the slightest bit of throttle. I am not convinced that ive gotten the vaccum lines exactly right I have checked for leaks and couldnt find any, however if I pinch off the line running to the fuel pressure regulator it smooths right out. Any ideas?

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Sounds like your fuel pressure regulator may be leaking....Pull the vacuum line off and check for fuel.

Posted on Mar 18, 2011

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