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I could write you a list a mile long on causes of running problems on petrol engines, I would take Panic Button's advice, give it a good service. Going on my own past experience it sounds as if the fuel filter needs changing as a first step. If it helps my Renault 25 had two, one a metal canister near the tank and another smaller one under the bonnet.
Regarding the headlamp, if changing the bulb made no difference I would suspect that water has got into the lamp and dulled the silver reflector in the back of the unit. The only cure for that is to fit a new headlamp.
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