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MGB 73 MGB ignition troubleshooting

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MartyMGB73

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I own a 73 MGB with an XR700 electronic ignition. The car runs fine until I take it out on 90 degree plus days. Then after about 10 miles of driving the engine starts to sputter and quit. It seems to lose its spark. After an approximate 15 minute cool down, it will usually start up normally. I replaced the coil last summer thinking I solved the problem. But a hot summer day this year proved me wrong. I'm suspecting the electronic ignition?
 
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