the car runs/drives/sounds fine up until 4k and then it feels like it's bouncing off a rev limiter and it totally stops accelerating. this is like an off and on problem. it started doing this on monday, stopped doing it on tuesday, and then started doing it again yesterday. i looked under the hood to see if maybe something was loose but i couldn't find anything. the check engine light never comes on when it does this. the abs light is on but i doubt that has anything to do with it. car is 100% stock accept for a removed silencer.