Hey guys 02 4.3l blazer idles at 3000 rpm on start up and then goes down to normal when engine gets up to op temp. I replaced the IAC valve twice but used cheaper sensors so I'm wondering if I should buy the Delphi one. I have a check engine light on but haven't been able to scan it yet. I'm guessing I just have a bad IAC since the TPS data seemed fine when I checked it and the TB is clean because I had to replace the plenum gsksets.