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Motor mounts are bad
you have a cylinder misfire
Need to know year and type of car including what motor please.
? !!!!!
outboard motor will start and idle, but dies out under load
You will have antifreeze leaking out and dripping on the ground.
Either the fuel mix is adjusted wrong or the carb is dirty
It starts the motor.
It really depends on the make/model of your car. Suspects include: Idle Stepper Motor/control valve, engine CPU, fouled injectors, incorrect spark plugs
Sounds like a motor mount or a transmission problem.......
cold engines hve high idles because the pcm is dumping fuel into the motor in order to increase engine operating temperature. when speified temperature is reached, the amount of fuel is decreased an the rpm drops down to the lower idle speed
if you got an automatic depending on what gear it is you may need a 2800 or 3500 rpm stall in your torque converter call a transmission shop if that's it they will help you