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Holden Vectra keeps stalling and revs are too high

My 1998 Holden Vectra has been plagued with a problem ever since it first broke down in 2010 when a faulty camshaft sensor was replaced. Three different mechanics have not been able to rectify it. The first day after the repair, in 2010 the car would stall at the lights unless the air conditioning was left on. I was told by the mechanic that the car just needed to 'get used to the new device', but over time the problem has become worse. The car now occasionally stalls while stationary regardless, but just as frustrating, the revving on the tachometer is inconsistently high, which is making it harder to brake as it feels like the car is pulling against me. Usually after freeway driving but also uphill driving, the revs sit around just over 1000 when stationary and the car sounds loud and shakes a bit. In neutral it climbs between 1500-2000 revs, again, far too high. Finally, on the freeway the revs tend to drop away sharply rather than smoothly when I take my foot off the acceleration pedal, leading to a sharp loss of speed and problems trying to keep a consistent speed. Do you have any ideas on what the problem might be?

I would be checking the idle stepper to make sure it is working as it should.

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