daihatsu Hijet 993cc 6 seater efi 1996 pinking sound when driving in every gear

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hi there
we baught this car a couple of months ago its clean on 26000k on the clock genuine mileage it only covered 6 miles between its last 2 MOTs had to replace the throttle cable and replaced temp switch but we are still getting the pinking sound in all gears when you apply the throttle:?:-? can anyone give us any ideas on what this might be thank you