it's an integra, manual if i dont warm up the car in the morning, the car dont speed up very smoothly (like i said, it feel a little "sandy"), both in engine's sound and in the vibration of the car. i can even feel it in my foot that's on the clutch pedal too. this sandy feeling lasts for about 10 mins or something like that. then again, it's just feeling. I could be just imagining it. Does anyone experience the same problem?