Question about 2003 Chevrolet Malibu

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Engine stalls when foot not on gas pedal

I have replaced the fuel filter, idle throttle valve and just put in a new battery.The engine starts but if I take my foot off the gas pedel it stalls out. It begans to stall around 15-1800rpm

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Sounds like a large vacuum leak to me possibly a bad mass airflow sensor but i would pinch off vacuum lines maybe spray a little carb spray around throttle body and intake area to try and locate any vacuum leaks

Posted on Jul 12, 2010

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1 Answer

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IAC valve - idle air control valve or IAC air passage is pluged also clean the throttle plate and it's bore . Or take it to a repair shop that has the diagnostic equipment to test .
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Have checked the idle air control valve. If stuck closed it will not allow air to bypass the throttle therefore it will start and stall.

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2000 gmc sierra battery died and i put new battery in but now the truck will not idle. It runs but as soon as i take foot of gas it stalls. What do I need to do?


clean the throttle body and idle air control valve start it and hold your foot on the gas and release the pedal the idle needs to relearn its position

Aug 16, 2012 | GMC Sierra 1500 Cars & Trucks

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My 1992 gmc pickup is giving me a fit. It will only stay running if iv got my foot on the gas pedal,otherwise it surges realy bad and dies. The fuel has a weird smell.I've replaced the fuel...


his problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Jul 13, 2012 | Cars & Trucks

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1997 honda odyssey rpms go up and down while in park and trys to stall out when in gear and take foot off gas pedal


The idle speed in your car is controlled by a computer (known as the PCM), the computer controls a valve called the Air Bypass Valve, this valve and the throttle valve get full of sludge from fuel vapors and combustion "blow back", this causes the valve to stick or move slowly, this in turn causes surging (speed goes up and down) in the idle speed of the engine, it is the most common reason for idle surge on any fuel injected gas engine up to about 2004 when car makers starting using electronic throttle control. To clean the idle speed control valve and the throttle valve do the following.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professiona

Jan 31, 2012 | Honda Cars & Trucks

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I purchased a 1997 chevy blazer ... looks great interior and exterior... but when I drive and stop, i have to keep 1 foot on gas pedal and one foot on break. what do i do ?


Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem get a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, spray it into the air intake of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is know clean, if you continue to have the stall out the idle speed control valve may be defective and requires replacement.

Mar 04, 2011 | 1997 Chevrolet Blazer

1 Answer

Car will not start without pressing gas pedal to keep idle speed up. If I keep idle at 900 RPM or higher it runs as long as foot is on gas pedal. It then stalls out when I take foot off gas pedal. No...


Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.

May 14, 2010 | 2000 Toyota Camry Solara

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Wont hold idle will start with foot depressing gas pedal will run with foot on gas but stalls when foot removed


Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.

Apr 14, 2009 | 2001 Jeep Grand Cherokee

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