A lot vs. Alot: 9 Grammatical Pitfalls
tunnel vision n.
Vision in which the visual field is severely constricted.
To bring something, esp a car motor, to its best state of effectiveness; tinker with to improve: tuning up for the race at Santa Ana
[1901+; fr the process of tuning a musical instrument, suggested by the fact that the performance of motors can be gauged by their sound]