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If you say it's around 3000 RPM, it could be a bad MAF. You live in Riverside too? haha I am currently helping a person in Riverside..I live in West Covina.
A bad water pump would not cause misfiring, although that is a good point because he says it only happens when the car is warmed up. What do I know though.
Also, if there was a head leak, and coolant was leaking in with the oil/gas it would spew out white smoke.
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