When you press down on the accelerator on a Proton Persona SLI why would the engine rev very high but have little power?

Answer

If it's still driving and the revs are increasing but the cars not going any faster I'd say 99% chance the clutch has worn out/slipping.

EG: if your driving along a road at say 40mph and you get to a hill, the engine revs harder but car either maintains same speed/speeds up really slowly or inthe worst case....slows down! i agree with above but i would say the other 1% could be fuel problem (not enough) although mainly a carb problem it is possible for injection systems to get a blockage in the fuel line, the fuel filter and possibly the fact that cold air coming in from the injection system intake pipe can cause ice to form inside then the heat from the engine melts the ice particle causing water to mix with the fuel possibly worsening to cause the car to "kangaroo" ( early cars had a summer / winter setting on the airfilter intake pipe to combat this problem

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