Wont keep idle, car stalls out

There are several potential issues that could be causing your 2005 Chevy Monte Carlo to spit and sputter while driving. Here are a few possibilities:

1. Fuel delivery issues: If your engine is not receiving the correct amount of fuel or air, it can cause hesitation or rough idling. This could be due to a clogged fuel filter, a malfunctioning fuel pump, or a problem with the air intake system.
2. Ignition system issues: A faulty spark plug, ignition coil, or other component of the ignition system can cause misfires, which can make the engine hesitate or sputter.
3. Emissions system issues: Your vehicle's emissions system is designed to reduce harmful pollutants in the exhaust. A malfunctioning component of this system, such as the oxygen sensor, can cause the engine to run poorly.
4. Electrical issues: A damaged or worn electrical component, such as a sensor or relay, can cause the engine to run rough or stall.
5. Transmission issues: If your vehicle is experiencing transmission problems, such as slipping or shifting issues, it can cause the engine to hesitate or sputter.

To determine the exact cause of the problem, it's best to have your vehicle diagnosed by a certified mechanic. They can perform a diagnostic scan to check for any error codes or issues with the engine, transmission, or emissions system.

injectors

what size engine? any repairs lately to the engine? when does it stall? freeway speeds, around town or at lights?

egr valve causes rough idling and stalling problems.check engine oil level could have low oil pressure.have vechicle code scan could have bad knock sensor.

Fix your car right away by clicking the link I attached Chevy Monte 1995 1999 Factory Service Workshop repair manual

I don't have an answer for you, but I do have a similar or maybe even the same issue with mine. It usually starts up fine, and idles and runs fine when first started, however a few blocks or a few miles down the road it starts to cut out on me, sometimes dying completely... throwing it into neutral and pumping the gas usually will keep it running. This has gone on for a couple of months. When it does die, It normally will restart after sitting for a few minutes. Then a couple of weeks ago it died on me (normally this happens when slowing down and coming to a stop,) and would not restart even after a 1/2 hr, I had to have it towed. I periodically attempted to start it for over a week, it would turn over, but nothing more...then someone suggested that I disconnect the auto start box...It started right up. However, it still continues to cut out when slowing or stopping unless thrown into neutral and pumping the gas. It seems to run better on the open highway, than it does in town with all the slower speed and stop n go. I bought this car used about 6 mos. ago, and considering it's age and the 135K miles on it, I don't want to put any more money into it. I just read there is a recall on this vehicle for the fuel pump and additionally the fuel assembly, I'm not sure if this would be the answer to the whole problem or not.

sounds like the fuel filter is clogged around 30 dollar fix maybe less

A backfire blew a hose off the intake manifold.
Put the hose back on and it will be fine.

If I understand correctly the car will idle but will not drive unless you pump the gas. If that's the case then you need to have it overhauled. There are blocked lines inside that are preventing it from working properly. Hope this helps.

Replace your fuel filter.