So I have a very old 351W (209,000 miles on it) running on 7 cylinders, one problem at a time. I got a brand new Tomco Motorcraft 2100 replacement carb. All the parts are the same from the Motorcraft to the Tomco. I have the carb properly jetted, took the jets (43F) out of the old car which idled really good at this altitude, I live in Sedona AZ, and put them in the new one, how ever with the new carb it idles really high and I can even back the idle screw all the way off the throttle bracket and the car will still idle at over 1000 rpm. Do I need to put a new power valve in, should I just use the old one or get something new? All help is appreciated. Also the other jet sizes I have are 48F and 53F.
I did a manifold vaccum test and the needle rapidly shook from 10-13inHG at idle and dropped when revved. don't know if that is because of power valve or what, I really need help with this because this car is my daily driver.