So latly my 00 blzr has been slowing down ..on an up hill it's like damb there peddle to the floor but not revving high. On straight road I can goto 45 and bam doesn't go faster.is it my distributor or something else.

 

I’d start with checking fuel pressure and checking the catalytic converter

 

Welcome to the Blazer Forum.

Post a description of what the symptoms are and if it was caused after some servicing or repairs in the appropriate section please.
Also add the engine and transmission type.

2nd gen trouble shooting