Car stalls upon releasing gas pedal

You may be noticing the fuel injectors shutting off. This is normal. Most engines these days completely shut the fuel injectors off when you take your foot off the pedal to improve gas mileage and lower emissions. The only thing keeping the engine turning at that point is the forward momentum of the car, so it might well feel as if the engine is stalling or feels jerky. Try this: As you approach a stop light, take your foot off the gas and coast (in gear). As you slow down, you’ll reach a point where you’ll feel the car surge ahead a little. This is when the fuel injectors kick back in and start spraying fuel. It usually happens at a fairly low speed, like 5-10 mph, and it does this so the engine doesn’t completely stall as you slow to a crawl approaching the stop light.