I have a 2003 Honda Element with almost 130,000 miles. It wants to die when the AC is on and I come to a stop. Turn the AC off and it’s fine. Already had a tune up, idle adjusted, and no computer codes are showing up.
The problem might be caused from a faulty Idle Air Control valve. This valve controls the engine idle dependant on the load impossed on the engine. For example, when the steering wheel is turned and the power steering pump imposses a load on the engine, the IAC valve moves to a position to allow the right amount of air into the engine for that load so the engine doesn’t stall. It could be that the IAC valve is failing to go to the proper position for the load the AC compressor imposses on the engine when at idle, and the engine stalls.
You can confirm if it’s the IAC valve causing the problem. The next time you feel the engine is about to stall, with your left foot firmly step on the brake pedal. Now slightly step on the gas with your right foot. If doing this prevents the engine from stalling, have the IAC circuit/valve checked out.