OPEL CORSA LITE REVVING HIGH 90% OF THE TIME WHILE IM ON THE ROAD.THE ENGINE WILL REV SO HIGH THAT THE NEEDLE OF THE SPEEDO STARTS SHAKING.

It really would have helped if you told me what you have replaced, in the future please do this. Now back to the high idle speed, the cause I think is a leaking intake manifold gasket, to verify this buy a can of spray Carburetor cleaner from any auto parts store, spray the cleaner around the entire area where the intake is bolted to the engine, if the engine slows down or starts sputtering or dies out you have found a leak. The idle speed of modern cars and light gas trucks is controlled by a metered vacuum leak, the device that controls this is called the Idle Speed Control valve (ISC), so any other leak increases the idle speed. It really would have helped if you told me what you have replaced, in the future please do this. Now back to the high idle speed, the cause I think is a leaking intake manifold gasket, to verify this buy a can of spray Carburetor cleaner from any auto parts store, spray the cleaner around the entire area where the intake is bolted to the engine, if the engine slows down or starts sputtering or dies out you have found a leak. The idle speed of modern cars and light gas trucks is controlled by a metered vacuum leak, the device that controls this is called the Idle Speed Control valve (ISC), so any other leak increases the idle speed.

Thank you for the time and advice. we found the problem. we replaced the TPS (throttle position sensor) as that was faulty. so much better now :) Thanks again. Thank you for the time and advice. we found the problem. we replaced the TPS (throttle position sensor) as that was faulty. so much better now :) Thanks again.