I had a similar problem. The issue was the EHA valve. Check this post out and see if it helps
http://www.peachparts.com/shopforum/tech-help/353372-systematic-testing-fuel-components.html

EHA checks ca 19 ohms. And voltage on pins. Need to check the current.

Any idea how to test the OVR relay? Like the zener diode in it?
Or just call it a replace and eat the cost?

I did pull the IACV connector while the engine idled (at 500 rpms) as suggested above.
The rpms did go up. 100, or maybe 200 to 600-700. When I reconnected the IACV plug, the engine coughed once and died.

Your thoughts?

Have you checked your duty cycle? Engine must be fully warmed up to do so.

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