Opel Corsa 1.4 Faulty

Bmuzuma

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Oct 9, 2019
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Hi, I have a 2008 Opel Corsa 1.4. The highest speed it goes is up to 140km/h and the rev will be at 7 already. It started after we replaced the intake valves. The recently started loosing power and it cannot go uphill or even at a slide hill or across a stream. The highest speed now is back to 80km/h and when pressing the accelerator, only the rev goes up but not speeding. please help. I recently replaced the plugs, oil filter, air filter, engine oil, coolants and petrol filter. When it stops the rev count stands at 1 and the temp is fine.
 
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