VAUXHALL VECTRA 1.9 CRDTI 07 PLATE?

I HAVE HAD MEGA PROBS WITH THIS CAR, FIRST IT WAS LOSING WATER, NOT MUCH, REPLACED THERMOSTAT, WATER PUMP AND HEADER BOTTLE, NO DIFFERENCE , TEMP GAUGE VERY ERRATIC , NO WATER IN ENGINE OIL OR THERMOSTAT, NOW HAVE NOW POWER, CAR MAKING A LOT OF NOISE WHEN REVVING UP BUT STARTS AND IDLES OK. CAN ANYONE HELP I AM AT MY WITS END WITH THIS CAR, OH AND I THINK THE AIRMASSFLOW METER THING IS FAULTY TO