i have an 88 gt with jasper motor maybe 87 motor not sure. i have a b303 cam with roller rockers and my car runs like crap. have to shift early, it put puts like the motor breaks up. cuts off sometimes. someone told me the cam is not meant for the heads so what can do to fix this. maybe a303 cam? also can i chip it with an a303 cam. my engine has no mass airflow sensor.