My car does not speed up when I hit the gas. what is wrong??

My car does not speed up when I hit the gas. what is wrong???
Okey, I have a 95 eclipse GS. The only problem it has is when I totally stop, then attempt to speed up. The RPM goes really high but then speed just passed 10mph. Also when I'm doing like 40mph and like the road is going up by a bit, I hit the gas but only the RPM responds. No speed. The problem is that when going uphill not steep at all the car's speed goes down fast.
as well, I man that I know has a 99 oldsmobile Baravda V six with the same problem. The only responds he gets is higher RPM no mater how fast or how slowly he accelerates.
The pre owner of the car has one of those 30$ high flow air filters installed. I was thinkin about to get one of those 200$ cold air intakes. could that can be crack the problem a little bit?
thanks for readin

Auto or standard? and how many miles? may be a slipping clutch or weak auto trans. Maybe your e brake is partly stuck on. I`m sure a cold air intake could do little to help except maybe make the car lighter by $200 missing out of your pocket

Replace the TPS.

Your transmission is slipping. Have it checked by a professional.

Good luck.

could be your transmission

it sound like you got bad gas or your coprator needs fixing

yeah I goed to say clutch but someone did already. air filters etc will not make a difference if the problem is between the engine and the wheels.

junk it, purchase a bicycle. or just walk