ah, the mystery...
Since it runs fine in neutral, I doubt this is a fuel restriction, but a fuel pressure gauge couldn't hurt. The way I understand it, if pressure goes down as it bogs down, you have a restriction upstream of your fuel pump.
Also, check the advance weights in the distributor. They could be rusted up and not moving well. Is your choke opening properly? If it stays closed that will also cause the engine to bog down. You may be running too rich. Stuck advance weights keep it from running leaner, if I'm not mistaken.
Since it runs fine in neutral, I doubt this is a fuel restriction, but a fuel pressure gauge couldn't hurt. The way I understand it, if pressure goes down as it bogs down, you have a restriction upstream of your fuel pump.
Also, check the advance weights in the distributor. They could be rusted up and not moving well. Is your choke opening properly? If it stays closed that will also cause the engine to bog down. You may be running too rich. Stuck advance weights keep it from running leaner, if I'm not mistaken.
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