Throttle Sputter at high way speeds
I am experiencing what feels like throttle cut off at around 49 miles per hour. I have noticed that as I held my foot down on the accelerator, the engine would stop accelerating at times. It was as if the gas was restricted for short intervals. I would let off the pedal for a few seconds, then press down and it would be ok. This issue used to happen sporadically, certainly not all the time as I know for a fact that I have gotten her pushing 65 mph quite often in the past. However, yesterday I drove her quite a bit on the highway and could not at any point in time get her over 49 mph. I know that the fuel filter was just changed but wondering if possibly a symptom of a bad fuel pump? I actually have a brand new one that I haven't had time to install. What are your thoughts?
To refresh your memory, its a 1987 366 gas engine with a rebuilt Holley 4152 carb.
thanks for your help//