I finally got my new fuel pump assembly installed on my 06 C 50 but now it idles way to high. When I originally took it to the dealer they made some adjustments, but still could not get it running. They changed the oil and put in an air filter and gave it back to me broke. Anyway I just installed the new pump. It was the regulator I needed but couldn't buy it seperate. How do I idle it down. I never have messed with fuel injected throttle body?