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found the problem. I took the distrubitor plate out. It was allgummed up. i cleanded it and lubed the three contact points. Put it back in and the surging problem is gone!
All that seems to work okay. It is when I hook up the vacuum line the engine starts to surge badly. when I remove the vacuum line the engin smooths out and runs great.
The vacuum advance is new and seems to work. the spring tention in the distrubtor seems to be very strong. I feel like when I hook up the vacuum it has to vork very hard to move the plate the i goes all at once and ove shoots.
The vacuum line comes off of the bottom of the carb, a two barrel auto lite. This vehicle is stock all the way. My dad bought it new in 67 and I just use it for hunting. I have tried sucking on the vacuum advance but cannot budge the distributor plate.
Have a 67 bronco with a 289. I recently replaced the timing chain and got it running and timed. But when I attach the vacuum advance vacuum line it starts surging badly. The vacuum advance is new but when I apply vacuumed to it I cannot get it to move the distributor plate seems very stiff and...