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I have a 1971 GTV with SPICA injection. Recently the idle has started acting up. Normally it idles at 1,000 RPM. Lately the idle has moved to 1,200 to 1,400 RPM. Occasionally it will idle correctly but the next stop the idle goes back to the higher speed. How do I correct this situation?

Mark Thomas
 

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First thing to check would be the distributor, to see if the advance is not dropping back fully at idle. That's a very common cause of this kind of idle problem. Put a timing light on it and see what's happening with the advance.

Andrew
 

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Could be a failing T/A. Check the pump gap with the engine hot. With the long rod connected, it should be .019".
 
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