I have a 95 z28 with 150,000 on the dot today! im having problems such as a rough idle?? spuddering from 1500rpms to 2500rpms but yet when i give it more gas i takes off...seems to me i can feel a hesitation in the gas pedal and im smellin fumes of gas like they are not burning off ...fuel injectors maybe?? the car has cut off on my a few times but not alot when i first start it up...?? any ideas?? thanx alot