i need to know how much a new motor will cost thats if i even need one.my car will go but it wont even hit like 10mph i was wondering if any one knew what is wrong and could help me thanks

 

A little more info would help here....How does it run? Does is start easily? What car?

 

it is a mazda rx7 gxl it turns over but when u put it in gear it will like only go 5mph

 

You need to provide a little more info on what the car is doing/not doing. You have given us exactly nothing to work with. What year? Does it run rough? Hard to start? Smoke? Any other symptoms?

What you have given us so far is about equal to "My car is broken. Fix it.". Not enough to go on.