Low idle?

4.8 v8. This problem only in the morning when its cold. Normal driving is good

Last week the motor when warmed up started idleing slow sometimes when stopat light.

When you slow down or stop the idle drops way down or the engine dies. A mechanis in a parking lot told me it was the idle air sensor. Is there such a part or is that not the right name for it? He pointed to a small box and said it was in it. The box sat on top pasenger side.

The check engine light code showed that my mass airflow sensor needed to be changed. I did this but the problem persists. My vehicle will not idle properly and stalls at low idle (for instance, when I am turning of the highway or sitting at a traffic light). What may be my problem?

Engine Performance problem
2003 Chevy Silverado V8 Two Wheel Drive Automatic

Hi there! I have an odd issue with my truck. You can start it, it idles fine. Wind up the motor, it sounds fine no misses, backfiring etc. When you let off the throttle if you are in nuetral it will idle down to 200 rpm. If you have it in gear it will just die, like you turned off the ignition. Truck has a 4.8 liter v8 if that helps, any ideas?

Could be a torque converter not unlocking. Had that issue on one of my gm cars. My 03 silverado began having an idle issue. It would idle slow and sometimes die. It was a simple fix. I took the throttle control off front of intake and cleaned the intake port. Had to scrape out junk and gave it a shot of carb cleaner. Ist been fine for 2 yrs.

I have a 2003 Silverado SS 6.0 liter, when it idles it will idle normal and then all of a sudden it will idle very low to the point where it will almost quit. It does this often, idle normal and then all of a sudden idle very low to the point where it will almost quit and then come right back to normal.

I have a 1999 GMC Sierra with a 5.3. The truck runs fine when you crank it and is idling, but if you give it throttle over 3,000 RPMs it starts to miss and throws a p0300 code. I did a tune up and replaced all fuel and ignition parts, even replaced some sensors MAF, crank sensor, TPS, temperature sensor, 02 sensors, just about everything. Truck has no vacuum leaks. Need help!