2003 Chevrolet Tahoe Q&A

2003 Chevrolet Tahoe Question: 5.3 idle is 600 I think this is low and sometimes the idle pulsates.

Have used at least 1 gallon of additive/injector cleaner has NOT made any difference. Took it to AutoZone checked the computer for codes NONE. Runs fine once you get away from Idle. -
Answer 1
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 -
Answer 2
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. -
Comment 1
What type of damage would have been caused? -
Comment 2
Yes in your climate it is necessary to have coolant warm the throttle body because of the cold temperatures in the winter. I live in southwest Florida. You really don't need throttle body warming here. Please do not play chemist with additives. More is not better. -
Answer 3
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 -
Comment 1
Today I removed the throttle bodyand throughly cleaned, it was very dirty also changed the air filter. I will see how it reacts over the next couple of days. And whats with the coolent connection on the bottom of the T-body? does the coolent cycle around the T-body? Today - I don't know if my tach is wrong but my idle is now 500. -