yeah that can be a number of things. Hows the motor sound, whats the idle, is your fuel MPG suffering, do you notice a drop in coolant levels etc etcs.
How many miles are on the motor and was it sitting for any period of time over 6 months?
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"so persuasively did they talk; and yet there is hardly a word of truth in what they have said."
Plato, Apology
"On life's journey faith is nourishment, virtuous deeds are a shelter, wisdom is the light by day and right mindfulness is the protection by night. If a man lives a pure life, nothing can destroy him."
Buddha