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I have a 2002 wrx wagon that’s basically stock just a downpipe and catback running a Cobb stage 2 91 octane tune (currently running 93 vpower from shell where I always fill up) when I put the access port in the car it was fine for an hour or two then I started getting massive knock values (-11.95) on drives over 15-20 minutes around 2300-3000rpm I put in new plugs and a new air filter I really started to notice the problem after the oil change (rotella t6) then today no knock and was giving her the beans and the dam dropped to 8 then 4 then zero instantly let off and limped it to work (was about 1/2 mile) reset the ecu and headed home dam came back to 16 Stayed under 3500rmps the whole way home and about half way dam just dropped to zero again I have no idea what is going on the car has 160k miles and the timing belt was replaced 40k ago it does have a stage 5 clutch (wasn’t me who put it in) but I’m stumped timing looks to be correct as well any hep would be greatly appreciated
 
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