300E Hesitation and cuts off at about 82C from idle

[nypnyc]

here is the problem 1986 300e 155,000mi starts and runs ok till temp reaches about 83C and then from idle hesitates and then cuts off, then hard starting for a few mins and when temperture is either higher or lower runs ok again till that aprox 83c comes and problem returns
I have done, changed dist cap and rotor, spark plugs and wires, ignition coil, idle control valve, fuel pressure regulator, checked and changed most visable vacuum lines, checked throttle microswitch and is ok
thinking about changing Fuel Pump, fuel accumulator, injectors, eha valve, gas tank screen
please i am at my wits end ANY THOUGHTS, thanks, Peter