[sr20de4evr]

well that's a big engine in a cheap car, so some engine vibration is pretty normal. It's hard to diagnose if it's just engine vibration without actually being there though. One thing you can do is get up to a speed where it starts doing it, then....shit I just noticed you have an auto, um shift to N I guess. The engine will go down to idle while you still go the same speed, if the vibration goes away then it's just engine vibration, if it's still the exact same then it's probably a tire that's slightly out of balance.

As for having to hold the steering wheel slightly left all the time, that's normal. It's so if you fall asleep, the steering centers itself and the car goes off the right side of the road instead of drifting to the left into oncoming traffic. If you get an alignment done they normally align it perfectly so it won't do that anymore. I got one done on my car after I lowered it and on a flat freeway I can let go of the steering wheel for atleast 45 sec to a minute and have it stay perfectly centered in the lane.