I have a 2007 Honda element sc with a vetch engine. At 4500 rpms and around 50-60 mph the car suddenly loses power. This also happens from time to time upon initial acceleration from a stop. I have changed the fuel pump and filter, plugs and coils and the vetch oil solenoid. The check engine light does not come on. I am at the end of my rope and ready to just take it to the dealer even though I know the dealer is a rip off. Can anyone help.