| I had a previous problem this past May-June and checked compression, it was fine then. today i checked: -The spark plug for cylinider #4, spark plug is "ok" (correct fouling), the coil pack resistance reads like coil pack #1 (cylinder is fine). -Removed the IACV/AAC vavle to really spray it with WD-40 and test it with a 9v battery---GOOD (click on both solenoids) -Only sprayed into the air regulator unit with WD-40 on both sides of the house tube inlets. Do you think clogged PCV Valves could cause it? O2 sensors? on the Blazt software, they should sweep (fluctuate the span of the guage). They have before, now it doesn't. it has a steady reading value.
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