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Old 08-15-2015, 10:12 PM   #1
Philhampton1
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Default Help with a deamon

So I just put a 302 engine from a 1968 mustang I found in my 1974 bronco. Ran great for a week then started stumbling at low rpm. Dies at idle. Missing and getting worse. Seems to be exacerbated by heating up. First I thought it was older edelbrock 600cfm I was running. Got a new one no help. Since then I have replaced fuel filters coil distributor plugs wires. Still doing same thing. Beginning to think it might be electrical. Wire from distributor goes to - side of coil and hot wire goes to + side of coil. With key switch on the hot wire only reads 6 volts. Is this right? Any other suggestions? Other than exorcism?
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Old 08-16-2015, 10:06 AM   #2
Boogie's_AutoRama
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Have you checked the points gap?
Make sure the contact heel that rides on the cam isn't worn out.
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Old 08-17-2015, 10:32 AM   #3
bop11
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Have you checked the choke? Electric or heat tube? Any loss of antifreeze, or sweet smell in the exhaust? Have you checked the valve clearances? 6 volts is about correct at the + terminal on the coil. With 12V, the coil would over heat so make sure you still have the red wire or a proper resistor in the coil lead if you are using a stock coil.
Other factors, electric fuel pump? Proper adjustment of the floats and needles on in the carb.
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Old 08-21-2015, 01:04 PM   #4
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Rather than jumping around, I would first exhaust each system by process of elimination. Check the + coil wire when hot and see if the voltage degrades with temperature. You should have 9+ volts so it could be the primary wire running from the plug at the firewall to the coil.

Good advice to check the points and cond. Again, once you've eliminated a system, you can move to the next such as fuel, which doesn't appear to be heat related.
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