WHY IS MY ENGINE LIGHT ON!!! chevy silverado 95?

diesel boy

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i have a 1995 chevy silverado runs good its a 6.5 litre diesel and every time i accelerate the engine light comes on and stays on until i let off the gas , what can cause this, my injectors are timed properly, i have plugged it in to multiple diagnostics tuners and even dealerships don't know what it is, any suggestions ???
 
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