my 2000 blazer still hesitates like its not getting fuel or air. if i put my foot in it. it will bog down then take off. plus it has a little "hicup" at highway speeds. here is a list of things i have changed, plugs, wires, rotor, tps, fuel pump, filter, cleaned maf sensor, it starts and idles fine, any help would be appreciated, as you can see it is getting pretty pricey.

 

any diagnostic trouble codes stored current or in history?

 

Did you use AC Delco plugs?

 

I had similar problems about a year ago, and pretty much replaced the same stuff you did. I would recommend getting a scan tool or finding a scan tool that shows "live Data". Watch your fuel trims while running and see if you get readings like -33 in my case. If that's the case do an aftermarket MFI injector swap. Also make sure your EGR isn't stuck open. I would also recommend checking your O2 sensors, but those are pretty good about throwing a SES light if they are bad.

 

lean in bay one and two but no codes now but still isnt fixed

 

try spraying some carb cleaner around the intake gaskets, also try removing the oil cap while the engine is running and see if it stalls out. Sometimes if the intake gaskets are leaking really bad it will stall. Or remove the pcv valve and breather tube on the passenger side and induce small amounts of propane while watching fuel trim on the scan tool. Also check for vacuum leaks around vacuum lines especially near the pcv

 

so by lean you mean the trims are a positive percentage.

 

i also have a 00 blazer and it feels like it hesitates when i take off like when it shifts into second gear at first it sounds bogged down then takes back off