Need help asap!(03 Sub 1500.)

[Luis Ramirez]

I own a 03 Suburban with about 118,000 miles on it .About a month ago I performed a major tune-up replaceing all spark plugs& cables , etc. But Recently, I've noticed a problem arise as while coming to any stop ,the RPM drops from about 1,000 to 600 & goes back up. It feels as it has a moment of rough idle while experiencing the drop but goes back to normal. Any ideas on what could be the solution to this ?

 

[Rocket Man]

I had the same symptoms and it turned out to be a bad MAF sensor. You might try cleaning it. I don't know of a way to test if it's bad.

 

[jerryjoe28]

I would check/clean the MAF and the throttle body first