Question about 2004 Chevrolet TrailBlazer

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Engine idles up and down and sometimes stalls while in gear or when shifting from reverse to drive

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  • Chevrolet Master
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The throttle body needs to be cleaned, grime buildup on throttle plate prevents it from closing completely, making engine run lean.

Posted on Nov 06, 2010

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After ideling a while i try to shift into reverse or to drive and it always dies .......any tips or ideas?


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Dec 17, 2015 | 2002 Kia Rio

2 Answers

Rough idle after engine is warm


Dirty air filter, dirty throttle body...try 2 bottles of gas line fuel injector cleaner...has your car been parked for awhile? Heet gas additive will work on any low gas tank sludge that you may have. Hope this helps.

Mar 24, 2014 | 1999 Mazda 626

1 Answer

Engine stalls when placing it in gear


Sound like a sluggish IAC (idle air control valve)
4_1_2012_7_42_08_am.jpg

Mar 31, 2012 | 1999 Honda Accord

1 Answer

I have a F250 lariat with a 460 - truck stalls when I put it in gear - even after it runs for 20 min. Sometimes it will stall while I'm driving. I had carborator replaced last year. Hope you can help.


Some possible causes could be:

Vacuum leaks cause an engine to run lean witch can cause the vehicle to stall when put into gear.

Improper base idle adjustment can cause the vehicle to stall when shifted into drive or reverse

A malfunctioning or damaged carburetor can cause the vehicle to stall when shifted into drive or reverse

Improper ignition timing can cause the vehicle to stall when shifted into drive or reverse.

A malfunctioning or damaged transmission or torque converter can cause the vehicle to stall when shifted into drive or reverse

Oct 31, 2010 | 1987 Ford F 250

1 Answer

Engine stalls when shifting into any drive gear.


It sounds like your idle air control valve could be going out on you.  The extra stress from being in gear can cause the car to stall out if the IAC valve isn't opperating properly.  The IAC is attached to the throttle body and is normally held on by two screws.  IAC valves are relatively cheap from AutoZone and easy to replace.  That would be my best guess based on your description.  Good luck and let me know if you have any other questions.  Thanks for an honest rating and for using FixYa!

May 24, 2009 | 1993 Mazda Protege

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