Hi there, new here, totally at a loss. I don't know where else to ask.
My 2010 ZR1 is stock apart from an Attack Blue air filter I put in recently. And then winter hit a bit. 13,000~ miles or so.
The gas in the tank was 15~ gallons from January 7th, Mobil 93. I got to drive it quite a bit this winter as it was mild.
8 further gallons were put in on 2/9, and then it sat a few weeks as there was salt on the roads.
Fast forward to the beginning of this month, I am seeing 6.5 KR at WOT, and in 6th gear to pass people. I never used to see any. And a flash of 2.5 KR at half throttle or whatnot doing half hearted pulls.
So this past Sunday I drove all the gas out to the line above empty and filled up with Sunoco 94. I have not attempted anything further to see if it is fixed.
I have plugs and wires waiting to go in. All fluids were changed recently. As far as I can see it, it's either this Attack Blue filter or the old gas not being 93. I know these cars knock A LOT on 91. I never saw any on 93 this past summer!
Or is it this Attack Blue filter? The intake is not modified. The OEM filter is no longer made. The only one available now is the more restrictive version from 06-11 Z06s. 12-13 were given the ZR1 version to compensate for the extra 2 cats. I have the original air filter to the car and it is spotless.
Any insight here would be great.