For about a week, I've been noticing the engine is less responsive, will tend to feel like it is shifting when it isn't, and almost seems to be louder than what it has been previously. I recently had a problem with the intake manifold leaking coolant, which required the gaskets to be replaced, along with the idler tensioner and accelerator position sensor (for other reasons). These new problems began soon after the previous work on the engine was completed. I am not receiving any codes or indication of a malfunctioning part, but I can definitely feel a difference. Is there any starting point for this?
