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Hi stop buying parts till you do a couple of checks.
The problem is either Spark or fuel.
We are going old school here.
1. Remove a plug wire from spark plug, with a gloved hand or insulated pliers stick the old spark plug or stick a phillips screwdriver about the same size as the top of a spark plug into the wire
2. hold the bottom of the plug or screwdriver about 1/4 inch from metal on engine block anywhere. Have someone try to start it and watch for a good spark to shoot across the 1/4 inch opening. If so you have spark.
3. Fuel D/C a fuel line somewhere on the fuel rail.
Put a rag over the end and have someone give a SHORT crank . Rag covered in fuel it's OK.
Once you find out if it's spark or fuel the you can troubleshoot the right system.
Most parts stores will have a fuel pressure tester available. This is the best place to start, as presence of fuel at schrader valve does not tell you if pressure is correct. Hate to say it, but without proper test equipment you will have bad luck trying to troubleshoot newer cars. For spark, use a timing light, or a cheap inductive spark checker pen. I got my last one for less than $5.
Does it crank? If yes, do you have fuel pressure? Needs 55-62 psi of pressure.(Blazers eat fuel pumps like candy, and this one is inside the fuel tank) Is the check engine light on? May have a cam or crank sensor fault. Need to be certain before throwing parts at it. The fuel pressure test port is right on top of the intake manifold. There may be a factory security system that's been activated, do you have the key fob?
I would suggest replacing fuel filter and maybe having a pressure test on fuel system and if pressure is low this would indicate fuel pump is weak and may need to be replaced..hope this helps and Please rate my post and good luck.
we was having the same problem with ours, we replaced map censer and tps, but that wasn't our problem , ended up being a loose wire, going to the fuel pump, on top of the gas tank, try checking the fuel pressure???, them censers wasnt cheep, but they might have something to do with it too,
we had a hyundai once, that stopped and started for no apparent reason , after much looking at and mechanics it turned out to be some butterfly or non return valves leading from the fuel pump to the engine. they were closing up and stopping fuel from passing through , might be the same kind of thing . hope this helps