I have a 1970 280 SEL with a 2.8l. The car runs great for about 15 minutes and then stalls. I replaced the fuel filter points plugs. Do the valves on this car need to be adjusted on a regular basis? I am also having a hard time finding a good manual for this car. Thanks for your help.

How quickly before it restarts? Have you checked to see if you are losing spark or fuel?

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Andie, you drive VW too?

If your car is Fuel Injected, you might look at the Aux Air Slide. If it sticks, the hot idle may have been set too low. I would say that the coolant thermostat has failed .
15mins is too long for warmup.

I have checked the fuel pump during this dying condition and i have battery voltage 13.6v at the pump when it dies. I put a standard condensor points and coil to varify that it is not an ignition problem. I believe it is a lack of fuel problem. if i crack a line to the injectors I have pressure. I question if maybe the anti-dieseling valve is not working but I am not sure how to test anything on this system. Yes I drive volkswagens and I am very good with their cis, and cis-e fuel injection systems. I feel that if i had a good quality book on this car i could fix it. If anyone knows where I can find one or has one for sale I would appreciate the information.thank you for your responces.