I've a Fabia MK1 SDi estate thats decided it no longer likes going up hills or accelerating at a reasonable pace. I know the engines aren't powerful but it has definitely reduced in power and its not been a gradual reduction, pretty much overnight.   I replaced timing belt (static and dynamic timing correct), replaced filters (air and fuel), checked fuel lines for air leaks, replaced throttle body and coolant temp sensor (both came up as fault on diagnostics but I suspect they pretty much alwa