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Sorry it took a while for me to get back to you guys. Yes, the check engine light is on. I just pulled the codes a minute ago and found two more on top of the initial one I was getting. P1504 P0102 P1507

Hello all! I'm experiencing some of the same issues as listed above on my 01' LS V8. I've replaced the IAC but, I'm still having the same high/low/rough idle. Could something else be the cause?