Under a steady constant throttle the car appears to slightly intermittently surge. I can feel it pull then recede over and over, though suttle. Seems to happen or is most noticeable in the lower RPMs. I would think that it might be the MAF sensor (which was actually replaced by previous owner a couple years ago) or something with the air/fuel mixture being off but I don't see the RPMs jumping around while under constant throttle. I did notice today that there was an engine surge and RPM blip while idling in neutral though. That may be normal, I don't know. Part of me is wondering if it's the drivetrain.
Don't know if this is related or a separate issue but on cold start the car idles very rough for about a minute, like the car shakes, then it smoothes out. Maybe a misfire? The car runs really rich upon cold start. I also noticed an intermittent click sound from the engine bay at times which I think is tied to to when the car is warming up and the RPMS float up and then rest and then goes up and then rests lower till finally the car idles smooth at like 750 RPM.