I have a Dodge charger 08,it lose power when I drives like 2 miles, I ran the car for like 70 mph and all suddenly it loses power and my speed drop to like 30 mph on the freeway! Which was dangerous,

This small paragraph fully explains the failure that your vehicle is experiencing please read it . The ECM and Electronic throttle control Sees a problem I hope this helps to make it understandable for you . Check with Dealer about a reflash or reprogram

The electronic throttle control and PCM possibly see a problem which limits the throttle opening and control of the vehicle

I keep having people say its the speed sensor

Also the car will start and ran, it just lose power when I drives

Electronic throttle control goes into limp mode when I problem is determined by the PCM for your safety and protection

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Should I sell this charger because I'm having issues with it

Dodge and Chrysler products have had this problem with the speed sensors and in put and output sensor failures also Use ohm meter to read sensors resistance value, replace either or both that do not read the correct resistance value. Check with all data info for specs .

Okay I drove the car today and it only goes 30mph and tranny will not shift to second gear.. Any help?

Does the rev like normal, and the tranny just want up shift, or can you manually upshift it with the selector . The catalytic converter could be blocked, this can easily be tested by a muffler shop by drilling a 1/8 inch hole ahead of the converter and one behind it , then they test for 1 psi difference from ahead verses behind it . This will confirm whether it is blocked. Chrysler / Jeep trannys had problem with electronic modulator valves and trans temp sensor that will cause this to occur

Probably the electronic modulator valve

Ok I have a 2010 dodge charger 3.5 motor it starts good idles good but when I try to drive it it has no power like I have to almost have it floored for it to move and then it will start jerking a little bit so I let of the gas and have to barly give it to get speed

Shouldn't have bought a used car stock dumbass!

Scott did you ever find out what the issue was