Force4

Hey guys I have this odd problem with my 351w that I havnt noticed until now (because I dont normally rip on it) but when ever I hit 4500rpm's in 4th gear the motor starts to sputter. Possibly timing? Fuel pump possibly?

Force4

any input on this? I tried it again tonight and it didnt stall but it was def sputtering at around 4500 in forth. Climbs right to 5500-6000 from 1st-3rd but 4th it does it ????