I got a Road Demon 650 Carb, that is what my friend said it was, for free. Problem he was having is it doesn't idle. Car starts, idle really rough, engine then dies. When he first installed it, it ran perfect. He took off the carb, and thinks when he bolted it back on he might have over torqued the nuts and warped the base plate. He installed another carb and engine idles good, so he thinks something is wrong with the carb. I installed it on my engine to see if it works and same thing idles really rough, I can keep the engine running if i put my feet on the gas but it sounds really bad. I tried putting a straight edge on the base plate and everything looks flats. Do you think having a warped base plate will make the engine idle rough? Do you think it could be something else. Don't want to spend a lot of money trying to fix it. Thank you for your help.