is this bad?

Every time I turn on my v6 97 mustang the brake peddle shakes like crazy! Now it just started to do this and I have no idea whats so ever what this might be any ideas? Also when im going up hill and barley pressing on the gas, my sterring wheel shakes like crazy aswell..... Now when i press the gas down harder its stops! I just got new rims and tires and the problem still is happening, now this only happens when i go slow and up hill but no other case. What ever input, please let me know thank you very very much.
Some rookie

Well, it definately ain't good!!!! Check all of your lug nuts on your new wheels and make sure they are torqued to the correct specs in the star pattern...don't use impact wrench to tighten them....

Thanks, i got my wheels laser aligned and my rims were tightened down correctly...and the problem is getting worse now, not only when i turn it on now, but when i turn the car off the brakes again shake like crazy...I think its time to take it in......:banghead:

might be your harmonic balancer. Is the engine shaking too, or just steerig wheel and brake pedal or what? Any knocking noises or anything from engine?

So I used my friends diagnostic machine and the code came up as sensor A cam shaft.....So we looked it up and it turns out that sensor A on my cam shaft is broke....Therefor explaining the misfiring as i turn my car on and off....The funny thing was: my inshurance company wanted to charge me $116 just to see the problem! and the to fix the problem, I would pay 100 more bucks for my deductable! WOW.....yah so ill turn in the codes to the and sav 100 bucks. Too bad the diagnostic wasnt covered by the warrenty....weak, but thatnks for all your help.:sunglasse