i have a 2000 chevy blazer that if you let it sit more than one day it is real hard to get started but once vehicle starts and gets warm it runs fine. i have replaced the following,fuel pump,fuel injectors,mass air flow sensor, idle sensor,primary oxygen sensor, catilatic convertor,plugs and wires, dist. cap and rotor, fuel filter,purge solinoid on intake and rear of vehicle,camshaft sensor,and if it sits more than one day is hard to start. i am dumb founded! i have a check engine light on that reports engine miss fire.

 

Have you tested the battery and alternator and used the 96+ Fuel System Diagnosis thread? Also, what was the exact code that was stored? There's more than one misfire code. Did you replace all those parts after diagnosing them to be at fault, or just throwing parts at the problem?

 

My vote goes to the battery. Get it tested/replaced.