I was tuning a car the other day and it went fine. I got all the fueling diled in perfect. car ran much smother and had more tip in response and was very crisp. So we went to the dyno for some numbers and to finish off the top of the maf curve and teh car would not go over 4500rpm. it was like it hit some torque management and droped the spark off like hitting a wall. but the fuel injector never fell off and the spark never droped. so we took it off teh dyno and on the street and it wont go past 4500 on the street when driving to the dyno it was fine. theres no bad plugs or missifire checked that and the cam and crank sensors are good.it runs and drives perfect but wont go past 450orpm. any ideas?
also i will mention the car has a manual 5spd conversion but all automatic tranny functions have been removed. like i said it drove fine all day and weeks prior to that.