Your car has fuel tank ventilation system consisting of non return valve somewhere around fuel tank, vent line, charcoal filter and valve. Fuel injection control unit is supposed to operate that valve in a way to keep tank pressure slightly below atmospheric - by keeping valve closed at idle [when there's low pressure in intake], cycling it at moderate loads and opening it when throttle is floored. Since I haven't experienced such a problem, I can only guess that it is caused by valve - I don't know if it's closed or open when power is applied, if it's closed, then one broken wire might be enough to cause this problem. I presume that in C series cars the valve is in the same location as in B series cars - attached on top of intake boot, with two hoses attached, one going to charcoal filter somewhere in right wing, another to throttle body. Take it off, inspect wires, test by sucking if it's open with no power applied, apply power with two wires from battery to see if it closes etc.
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