I am trying to track my loss of HP problem. At high RPM's 6000+ I lose alot of power. As my RPM's climb to around 4000 or so I start to hear what sounds like a buzzing or rattling. I think this is coming from outside of the car. I figure it is one of 2 things, The exhuast or the fuel pump. In the past the fuel pump has made some funny noises after the car has been turned off then back on a few minutes later. The other problem, probably related is when I start the car after it has sat for a few hours it bucks as I start to excelerate. If I keep my foot pressure even the car will start to accelerate then hesitate almost like its gonna stall, then recover all of the sudden. What can all this be? I'm looking to rule out or narrow down possible causes as I've already spent $400 at the dealership to fix a CEL for the EGR system. (they did a "service"  )T hanks for any and all help.
hunter green 96 mystique mtx, sabb side markers deep tints
car bra., K & N filter, hyper white low beams, after market fogs, JVC Kameleon head unit, 600 watt amp with 2 10" kicker subs, soon to come new rims
New adition 01/11/2002 The original 95SE in Midnight Red all the toys including traction control
Fog light mod, lightmoonroof switch from a focus, power antena (still wiring it up) post 98 sail panels, new water pump , Bosch quad plaitnum plugs, and a new Cat.
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