问：我的卡车开始有一个粗糙的偶像，大约6个月前，我更改了火花塞。

Therough idle通常与所谓的idle air control module/valvewhich regulates the air intake as it is mixed with fuel prior to being injected into the motor. When this is not working properly, this creates an imbalance in the air/fuel mixture which will cause the rough idle you are describing. I would recommend having an expert from YourMechanic come to your home to诊断闲置和维修。

你好。There may be a vacuum leak somewhere on the engine or loose or broken vacuum hose. A vacuum leak will cause a rough idle and may also the truck to stall and stop running. There also could be a problem with the electronic throttle giving a bad reading to the computer. There may also be a problem with one or more of the coil packsmisfiringcausing arough idle。我建议您检查真空检查是否有泄漏，并检查了PCM的代码。