I bought a drum of M1 in 2017 and shortly thereafter took my car apart. I just got it back out recently. The issue I’m having is I can’t seem to get any heat to show in my NGK plugs. I’d run the combination for several years prior to 2017 without this issue, the significant change being I dropped the displacement from 588CI to 522CI and installed zoomies versus headers. Data indicates boost is where it should be, so the supercharger is moving the expected air. EGT’s go up when I lean it out, and power goes up as well... but I’m several steps leaner than my suggested tuneup and still no heat. So... wondering if stale M1 will cause these symptoms? Cold plugs, high EGT, engine off on expected power... Thanks in advance for any experience you can share.