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sounds like a possible plugged heater core, restricting the flow of coolant. those require a special tool to remove, quick disconnect, just remove both hose from the heater core and back flush the heater core with a garden hose, NOTICE DO NOT DO THIS WHILE HOT IT WILL BURN YOU, this can make a mess, flush it both ways untill it flows clean and with even pressure, then refill the coolant and road test the vehicle to see if is changed.
Good chance fuel pump is getting hot and has to cool down before pumping back up to required pressure. I had to test fuel pressure when cool, then when hot to catch drop in pressure. Are you having any problems with how far you can drive before it quits, or starts to get sluggish?
Start by flushing your coolant system, then refill with a quality coolant.
Run up to temperature and check again for level (when cool again)
Check that the radiator is getting really hot quite suddenly when running from cold, as this is the best way of checking thermostat operation.
When over a set temperature (check your manual) the fan should come on.
If it never does - troubleshoot the fan (temperature switch or sensor first, then fan on direct feed to see if it powers up ok)
It is possible you have air bubbles in the cooling system. Loosen radiator cap or resivor cap and let idle for about 15 minutes. Tighten cap and drive and see if that helps. REMEMBER TO START THIS PROCEDURE WITH A COOL MOTOR AS THINGS WILL BE QUITE DANGEROUS DUE TO COOLING SYSTEM PRESSURE WHEN HOT.
I WOULD LIKE TO HELP YOU BUT ,THE CAR REALLY NEEDS TO GO SOMEWHERE AND GET PRESSURE TESTED.IT MAY NEED A THERMOSTAT,HEAD GASKT OR A WATER PUMP ,YOU WON'T KNOW UNTIL YOU GET IT LOOKED AT . TRY DRIVING THE CAR WITH THE RAD CAP TURNED BACK TO THE FIRST LOCK[HALF WAY] AND SEE IF IT'S O.K. .IF IT DOES'NT GET HOT THERE THEN YOU MAY NEED A HEAD GASKET. HOPE THIS HELPS.