My gas pedal is very stiff and makes it hard to control the throttle (I have a manual car). Anyway to adjust the tension or something????

 

Does it go back slow also or idle a little higher for a longer time?

If so, the throttle cable may be binding up from corrosion. Either that or the TV cable/linkage is binding.

Get under the hood and manually move the throttle. It should open pretty easy. If not, then your throttle return spring on the TB may be binding.

A shot of WD-40 should loosen it up for a little while, but the best way is to replace it.

The only other possibility (and it's happened to me) is the cable has worn its way through the housing/insulation. A common place is right near the firewall where it makes it's first bend.

Check all those and report back with what you find.

 

There are 2 cable things. One seems to be attached to the vaccum and the other I am not sure what it does. I had someone push the gas and it looks like only one pulls back. The other just stays there???????