When the fuel pressure is turn up to 40 lbs at idle the car wants to surge and carry on. The car will not stay running unless the you have the idle screw turned in for the car to idle at 2000 RPM. It almost sounds like the car is flooding out. When you turn the fuel pressure down to 24 lbs the car idles just fine. There is no surging and the car will idle around 700-900 RPM. If you turn the fuel pressure any higher it goes back to surging and carrying on. If anybody has any suggestion please forward them to me at [email protected] before I buy a carburetor.