Hey guys and gals: I have a 2000 blazer 4dr. I replaced the fuel filter, plugs, cap and rotor, cleaned fuel system (professionally), new air filter alternator.... anyways; my truck seems to lack power and sucks on gas milage. when it's wet it seems to really buck alot! it also hesitates alot but when you tromp on it goes. I have checked the plug wires and they appear to have no cracks. it was worse before I did all the replacements. No check lights on or anything. help please as I know the dealership will replace $$$$$$$$$$$$$ thousands of dollars worth of stuff and still not fix the problem.
cheers

 

Did you use platinum plugs?

 

I had a 1971 Mustang Convertible that did the same thing. I thought it was lacking fuel so I changed the fuel filter. No good. Turned out to be a bad coil wire. Might be a place to start.

 

yes I used platinum plugs.