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Well, you were basically right. I had replaced the plug wires last weekend and thought it was running ok, but I must not have ever gotten hard into the throttle. I found that the coil wire was not seated properly into the distributor. The backfire is gone now. Sometimes it just takes someone...

I just rebuilt the carburetor on my 1966 T-bird. 390, autolite 4100. It runs much better at idle now and starts easier, but under heavy acceleration it backfires. It did not do this before the rebuild. On the road if you put the pedal to the floor, you get good initial acceleration for a...

I have a '66 T-bird with A/C, but I cannot get any heat in the car. The control that directs flow for floor/defrost/etc. works fine, but I cannot get any heat, just vent. I've diagnosed that I'm not getting vacuum at the coolant valve under the hood. If I apply vacuum there it works fine...