not responding to pedal.
86 5.0 ls. Every now and then when I step on the pedal the car is not responding like on the highway i have my foot on the pedal. in my mind I doing 60+ but she will do 45 to 48. then after a min or less it will do what the pedal is position to do. or if I/m doing 50+ it will drop down to 40 to 48mph. But this is not all the time but quite fequently. I'm thinking I need to spray the hinge on the butterfly with wd-40 but what do you guys think?