My speedometer just started saying 100 when I'm going 80 or 80 when I'm going 60 and when I get the speedometer up to around 99 it starts cutting out the engine does it like lurches and as soon as it comes down it will run right only when it says like 99

 

You need to indicate what car you are talking about.... what motor transmission ,etc any mods done to cars. I suggest making a signature in your profile so you dont have to keep retyping it


*****edit*****
This also doesn't belong in the power adders section.... pick the appropriate forum above this and post i the correct one....or nobody may see it.

For example if you have a 1993 to 1997 Camaro.... post in the 4th gen LT1 section. Also most people introduce themselves in the new member section first