What is the reason for the Buick Regal 2.5 stalling during cold starts?

[LeEsther]

The reason for the Buick Regal 2.5 stalling during cold starts is excessive carbon buildup in the throttle body or leaks in the intake manifold or various valves. There are three key points for engine maintenance: Clean the air filter: The air filter is related to the engine's air intake during driving. If the air filter is clogged or accumulates too much dust, it will cause poor engine air intake. Additionally, a large amount of dust entering the cylinders will accelerate carbon buildup, leading to poor engine ignition, insufficient power, and naturally increased fuel consumption. Remove throttle body sludge: Sludge is formed due to carbon deposits from fuel combustion exhaust at the throttle body, as well as impurities not filtered by the air filter accumulating there. Excessive sludge can cause air resistance in the intake, leading to increased fuel consumption. Clean injector carbon deposits: Since the combustion chamber is prone to carbon buildup, which can cause difficulty starting, carbon deposits on the injectors can also clog fuel passages, distort fuel injection, and result in poor atomization, naturally increasing fuel consumption.