>>noticed a tinkling noise under load
Sounds like it could be pinking. Air leak into induction could cause a too lean mixture. Could be worth checking the ignition timing.
My Mazda B3 engined Kia now runs much better after changing the thermostat. It used to warm up quickly before, but the temp gauge rarely got near the middle of the scale - it does now. I know it's probably only a few degrees different and it could be psychological, but for the sake of three quid................
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