ive already replaced the air filter, fuel filter, catyliytic convertor and muffler and it bogs down at 6000 rpm and it feels weak all the way through the rpm range

please help me out

no cels either

 

Why are you replacing parts that may or may not be faulty?

It sounds like your EGR valve is clogged and needs a good cleaning. The egr valve recirculates exhaust gas back through the ignition chamber and can cause bogging and hesitation. The only thing that is making it not sound like your egr is the fact that it happens throughout your rpm range.

Have you tested your o2 sensor?

 

Check your fuel pressure and if your gas is good and not contaminated. Also possibly check plugs.

 

bogging down at 6000rpm....redline is like 6250, so it's not like you're loosing much of your throttle band.