The new o2 might be bad. Put your old one back in and burn a tank and see.
Yes the FPR needs a smaller line.

I changed the o2 sensor again and its the same outcome, is there anything that can throw the o2 sensor out of whack? My only other thing to turn to is my bootleg air filter.

What color is the tip of the O2 when you pulled it out? White is a lean condition and excessive caked on black soot is rich. It should be right in between both of those.

Throw the O2 off? Sure. A plug wire touching the O2 harness.

its normal, I also changed my oil and used injection cleaner. The cleaner helped a little, but my mpg still isn't 20 at least. Gas here is $3.05. I put $20 and get 100-115 miles. Could it be a faulty knock sensor? Also, most of the time when I m doing 50 mph and let off the accelerator the car slows down a little more than what it suppose to. It feels like I'm not getting enough air through my air filter. This is way I started to think its my air filter.

You say it slows down a bit more than it should. Are you sure your brakes are not dragging?

I was thinking that too. If the 2 bolts that hold the caliper could make them drag then this would be best and next place I'll look. My 2 bolts in both calipers were stuck and real hard to get out. I got it out but I couldn't get the rubber boot out to grease it up so I just c-clamped the bolts back into the calipers.

If you had to force the bolts in...that might be a good place to start.

No. Not even a remote possibility.

What would you suggest to getting those dried up rubber boots out?