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Old February 15th, 2008, 20:12
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CheapXJ CheapXJ is offline
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Join Date: Jun 2002
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Posts: 1,359
Re: 0331 head swap, mpg change?

just a thought here...

recheck the torque on your intake/exhaust manifold bolts.

EVERY time I've had them off, I've ALWAYS had to retorque them a week later.

could just be a simple vacuum leak.
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