I have a 2001 chevy blazer , If I do not start it every 10 - 12 hours it is hard to start . Once it starts first time , it starts fine the rest of the day. Weather does not change how it cranks. I have new tune up, new fuel pump , fuel filter , air cleaner , coil new ,I checked fuel pressure 60 lbs. , new battery , new starter....I'm out of ides.....PLEASE HELP !!!....I have 60 lbs pressure, cold , hot ... Pressure remains 60 even after I turn the key off ... I check the pressure at the fuel rail, that is after the fuel filter...I disconnected the fuel line after the fuel filter plenty of fuel...When it is not starting I can smell raw gas fumes...It is turning over normal....not slow...

 

It's almost always the same thing to start with on these things. The fuel pressure leak down test. With the key on engine off it needs to hit at least 60 then not go below 55 in ten min. If it drops faster then that there's a problem. Most often pump is failing but second most common is injector problems.
Do that test and come back with results. If it's not good to be absolutely positive it's not the pump you will need to do the same test from the filter.
You cane take of the plenum and inspect for obvious leaks, you will see shiny gold areas and not the consistent carbon crudded up look.

All you really need to do this is a deep socket 10mm and about an hour.

 

Does the starter crank longer before the engine starts, or does the starter crank the engine slowly? Makes a big difference for diagnosing the problem

 

The engine turns over fine , I had to replace the starter because it turns over so long befor it starts it burned up the starter. It has a new battery also .

 

My starting problems turned out to be The Magnetic pick-up under the Rotor...I replaced the Dist. cap , and Rotor .... It's been about a month.. Starts great every time ... Awesome ! !

 

The part underneath the rotor is the camshaft position sensor. Even if it's unplugged, it can not cause a no start condition. If it starts and runs now, rest assured it was a faulty distributor cap and or rotor. Glad you got her going.

 

I agree with capt hook my problem intermittent no start was a non ac delco cap and rotor after the Delco cap and rotor everything is fine starts every time