have a 6.0 with 706 heads and BTR Truck Norris (212/22X, .552/.552, 107 LSA) cam in a 2500HD, 10.5:1 compression, stock manifolds, 50 lb/hr injectors and tuned VE and MAF. Truck has consistently had P0300 (random misfire code) at idle or below 1600 rpm. Pulls very strong and I never see any timing being pulled on my spark retard table. Truck idles at 800 rpm and I adjusted my idle spark advance to 20 degrees for this cam - maybe too much? I've seen a bunch of people simply turn off P0300 and I am wondering if I should do the same? I have checked my coils with an inline spark light, spark plugs are new - could be fouled from the tuning maybe? Although it has had a random misfire code since before the tuning process and new injectors (did import new tables). Checked exhaust temps with an IR gun and they all go up to 240+ at the same rate from cold start to 5 minutes. Don't feel any hesitation or pops at any point and the CEL only blinks once or twice when I leave a red light and very rarely (1 out of 10 times)
Things I have adjusted Knock sensor level all 3 tabs 1.25 multiplier from 0-2000 RPM. Haven't touched global gain. I am looking for the least intrusive way to fix this without removing P0300 unless necessary.
Is this cam aggressive enough at idle to cause a P0300? are my timing parameters off at idle? just wondering if anyone has any experience with this and can help.