cracked rings, cracked ring lands, excessive piston-to-bore clearance etc. all cause compression to "blow-by" the piston and into the crank case. This causes rough running. A simple compression check will show you one way or another. A leak down test would be the next step to workout exactly what's gone wrong if you have abnormal compression readings.
Ever since I flushed the cooling system, cleaned the IACV , changed the pcv valve and reset the ecu it ran fine for 2 weeks but it comes back randomly, CEL light back on and lumpy idle but then goes away with the CEL light still on. I park it for a bit and and seems to just go away -_- ..
And I did notice it seems to always come on on really warm days (which has been these couple of days)
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