Could be a bad batch of fuel that has just clogged up an injector or two, might try some injector cleaner. Timing may have shifted, Oxygen sensor may have been clogged up, ACT sensor may be faulty or MAF sensor may have got oil or dirt on it. I would start by doing timing and maybe run some injector cleaner through. Run the EEC diagnostics to see if there are any fault codes there (will tell you if any sensors are stuffed). And maybe clean MAF hotwire (especially if you are using an aftermarket oiled aircleaner like a K&N).
what fuel mine always pinged on optimax, synergy fixed that :p
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Try some water injection and drive it hard or some hi-sh rpm you may have some carbon build up in cylinders...
An old technique in the carb days was to inject / squart some 2 stroke/ upper cylinder lube into engine while idling fast, then turn off leave for a couple of hours.Then take it out on hi rpm drive.Like speed limit in third gear [manual] etc..The lube softens carbon and rpm hopefully gets rid of it..
Often if there is a sharp piece of carbon in cylinder it glows hot and ignites combution too soon causing detonation...
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