Hello everyone. I have a 1968 Chrysler Newport with a stock 383 2 barrel. It has 155000 miles on it with a replaced timing chain, distributer (points, cond, cap, rotor), new plugs, plug wires, and the carter BBD has been rebuilt. I've owned the car for 25 years. For the last two years or so its been running lousy. The compression is consistant around 115 lbs. The vacuum at idle (650 rpm) is steady at 18. The car runs fine when its NOT warmed up. Then in about 5-7 minutes it starts hesitating and missing. This is most noticeable with a little throttle with a load on it. At idle (at a stop light) it runs smooth. If I wait a few hours, it still hesitates and misses. There is a dead spot in the throttle where the missing is most prominent. When you let off on the throttle to just above idle it will smooth out. If you open the throttle more after the dead spot it will pick up on power but still run rough. If I run through the throttle in park, it is hard to notice any of these symptoms. It is mostly noticeable under load. If I wait until the next day and start out stone cold it will run fine for 5-7 minutes again. (non of the described symptoms occur for the first 5-7 minutes) The choke is opening properly and the fast idle cam works fine too. I've also swapped coils and the same condition persists. I'm not sure what else to check and could use some assistance on this one.
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