500 SL 50,000 MLS CUTS OUT AT 80 DEG,S

1991 Mercedes Benz 500sl • 2WD Automatic • 50,000 miles

Hi. Car starts and runs fine until temp reaches 80 deg, release accelerator peddle and engine cuts out will start again but only if a little accelerator is applied. Does this 3 or 4 times then as soon as temp rises above 80 it runs lovely. Does not cut out if left ticking over up to temp ( only when using accelerator ) any ideas. Thanks John D.
Have replaced. Plugs, leads, dis caps rotor arms, voltage protection relay, water temp censor, idle speed actuating valve.

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