Hello Everyone, Anyone here in the Minneapolis area, I've got a 1936 Plymouth with a rebuilt motor, I can't get it to run well and am perplexed.  I should say that it actually runs beautifully for the first start of the day and until the engine warms up.  Once it's warm, the engine won't rev past a certain point anymore and it will cut out and surge, if I bring it up to the RPMs where this starts happening and sustain for a little ways, then it will backfire.  None of these symptoms occur w