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This usually happens after the car has been sitting over night. After firing the engine, it will shake though not violently, and I notice that the shake will lessen when I apply pressure to the gas pedal. I do this gently since it's the first start-up of the day. The thing is that this stsrt-up shake does not happen consistently. I have noticed that in mornings it may happen, yet also sometimes when I leave for work in the afternoon when it's sunny and hot the shake will happen too. I'm thinking that I may need to clean the throttle body, which I've never done before. I'm not sure if that will help. The shake rarely ever comes back after subsequent start-ups in the day. How bad can this be on the engine mounts?
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