1st question is to those of yall who have experience w/a car that has no power steering.
I'm having a bit of a problem with my car trying to get traction(i think..) whenever i come out of a turn/corner and i give my car any kind of power more than 25% throttle. Its more like the steering wheel and entire front end of the car vibrates/shakes/rocks VIOLENTLY when im under power and the wheel is turned and im at speed. Is that something i should worry about or is it just my arms being too weak to handle the horsepower going through the steering wheel?

2nd question is, whenever im at WOT, and my rpms start to near 6k - redline, i can start to hear my car quietly backfiring maybe 3 or 4 times before i shift. I'm not sure if its detonation or what?? Should i use better gas, or is this another sign of my engine needing to be rebuilt?