So tonight I put the OTTP kit on the car along with the tune. The tune is great, but i came across this when I parked my car the idle would purr then sound like a lil burp and then back to purring. The RPM never moved just the airflow from the exhaust changes why is that?
Any help is appreciated. Thanks

 

I would check all vacuum lines, clean the maf and clean the throttle body. Also what did you gap the plugs to?

 

I believe they were 32 when i checked all the vacuums seemed good. Not too sure no codes or anything nothing wrong with driving just that weird kinda purr and pulse from the exhaust. And like i said no fluctuation in the RPM