I replace my old stock distributor with a DUI electronic distributor on a 2F. I found TDC on the compresion stroke and but the distributor in so the rotor points to number one. The engine starts right up and runs good as long as i hold the throttol open. I cant get it to run at idel or the 650 rpm recommend to set the timeing . It was suggested to me that i need to adjust the idel screw on the carborator. I really hate to mess with the Carborator because a couple of years back I sent the carb in to Jim C. who did a fantastic rebuild and set so it bolted in and run great. Its allways run great. Would i have to adjust the fuel mix to get the thing to idel?