what the heck?

driving home doin about 75 i had the music a lil loud then i flet like a let of of power, so i pressed the gas a lil and niether the rpms or speed needles would move? so i go to pull over and the car shuts off when i start to slow down? i checked the belts alt timing everything i took my plugs out nothing i cant see anythign wrong here had it towed to my shop the only recent thing done to it was new plugs? could this have somthing to do with it?

It won't turn back on? Since you were listening to the radio, did that start to flicker on and off or get softer? How long ago did you do the plugs? If recent, make sure the firing order is correct.

You checked all the belts already so I'm kind of stumped. Low on gas? Gauge reading correctly? Fuel leak?

alternator? (wild guess)

What the hell? Why are there two of these threads? lol

probably a loose wire considering how much your electrical system has been worked on, someone probably just left something loose and it came off.

Do you have power? Does it turn over? My guess if the car just died when you went to slow down, I'm guessing it's fuel related cause you said that it would not go any faster judging by the RPMs and the Speedo. Try the Fuel Pressure Regulator maybe that took a shit on ya.

I bet it's the alternator. Do you have the heat shields on the turbo? I blew two alternators and completely melted my fan because I didn't put my heat shields back on. Bring the alternator back to the place you bought it and pretend it just crapped out ;) And if the heat shields are off put em back!