To start it in the morn I turn the key on and listen for the fuel pump to prime. Once it completes the prime I turn the key, letting it crank only once. It won't start with one try, so I listen for the prime. Then turn the key for one crank and stop. I do this 10, 15 times and finally it fires but dies right away. Next crank will usually start it.
I only let it crank once because I can turn the key and let it crank til it runs the battery out and never start.
But once started and I drive, it will bog and sputter for 30 seconds before it runs correct. Been that way for a year and a half.
I have began driving, during the sputter and bog, thrown it into neutral and it will Rev as normal, then back to drive and sputter. I think that is the tranny solenoids. I will try that next week.
But yesterday. I drove to the store parked for 5 minutes and it was really freakin' hard to start afterward. It took forever to do the one crank at a time method. Then today the same after a short drive and moment in the store.
I've changed fuel filter. Spark plugs, wires. New battery. Fuel pump primes just fine and seems fine when I hit neutral during sputtering.
What is causing the hard start?

 

I think you'll find the problem here: https://blazerforum.com/forum/2nd-ge...eakdown-88305/ Post all 4 numbers and we can analyze them for you.

 

I have a 2000 blazer that is hard to start when cold. It dosen't have the sputtering problem but I have found that after hearing the fuel pump prime if I turn the key very slowly to the point the engine cranks and no further, it fires and runs just fine. Try this for youself and see if it works for you. Maybe someone with higher knowledge can tell what direction to go. I figure it could still be most anything but perhaps it might be diagnostically useful. I've only gotten as far as checking CTS and IAT with a scan tool.