2003 Chevrolet Tahoe Q&A
2003 Chevrolet Tahoe Question: 5.3 idle is 600 I think this is low and sometimes the idle pulsates.
idle speed control motor could be malfunctioning. throttle body could be dirty as well. you need a shop with a real tech and a real diag. could be something simple. Roy - mastertech6371
By now you have probally done damage to the fuel system with that much additive. You need to have the air induction system cleaned. Have a professional clean the throttle body, Mass airflow sensor and intake with an approved cleaner. - EXPERTEC
clean throd body with carb cleaner with engine off open throdle wide open spray inside and wipe out with a rage dont use straw it might go into intake - delane 72 garage and body shop