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Old 07-20-2010, 12:20 AM
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1980 mustang question noone can seem to answer

I have a 1980 mustang with a 200 i6.Now here's the problem when I drive the car&get to about 45 the car will lose power&wanna die,Now this dosent make much since but Ill then adjust the air mixture screw &then I can go as fast as I want&it won't lose power but it will overheat.Also the heat will not come out the vents inless I keep my foot on the gas.We've checked the compression &did a pressure test&all was fine.I have no vacuum leaks so I took the Carb off&my buddy is gonna rebuild it.Hopefully this will fix the problem what do you guys think?Also I'm not sue what its called but where the lines from the heater controls go into the adapter&come out the other side &go to the blower motor door etc,there are two holes with no lines going to either side is that the way it should be?Also the thermostat &water pump are fine,well thanx in advance.Also I'm posting from my phone so if its hard to read sorry.

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Old 07-20-2010, 02:22 AM
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Its hard to read your post all bunched up the way it is. But it sounds like you might have hooked the vacuum lines to the heater up to ported vacuum (vacuum above the throttle plates in the carb) and not up to manifold vacuum.

That explains your heat problem. And if i am understanding right you say there are vacuum ports that are open to air and not plugged? I think they should be plugged.. maybe thats why the car isn't running right, it has a vacuum leak.

Otherwise a loss of power at speed sounds like a clogged fuel filter or faulty fuel pump.
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Old 07-20-2010, 11:30 AM
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No vacuum leaks,everything on the Carb was hooked up right,the ports I'm talking about don't pull vacuum,just an adapter.Fuel pump sounds like a possibility.
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