I know this has been discussed in the past regarding the fuel pump issue, but mine seems a little different. When I give the car full throttle from a stop it just sits there and makes a wrum-wrum-wrum sound but no movement. Then if I let off the gas and push it back down partially the car goes fine. This is not a huge problem but it is if you try to merge into traffic and the car just sits there. Any ideas?? I've got a Volant Intake, Iridium plugs, Ford racing plug wires, and a FC throttle body. Thanks in advance for any suggestions.