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Yes sounds like a regulator issue. On the 99 blazer the regulator is under the plastic intake plenum and is a part of the fuel injection spider. I would also check for vacuum leaks and your idle air solenoid.
Could be the pressure regulator on the fuel rail. Pull the vacuum line off the regulator and check it for fuel contamination. There should not be gas in the line. If there is fuel in that line the regulator is bad and needs replaced.
Put a pressure gauge on the fuel test port to find out if you have low fuel pressure. If you haven't checked the pressure regulator, that could be the problem. If that doesn't help, connect to a code scanner to see if the computer has detected any faults. Also, run a compression test; see about the general health of the engine.
It sounds like its possibly a bad fuel pressure regulator. Most parts stores will rent you a code reader, scan the computer for trouble codes. Come back here with any codes retrieved from the computer and we will help you figure this out. This could be a cheap fix, so I don'trecommend randomly replacing things, that will get very expensive.
Will it run for a short time if you squirt some fuel into the throttle body? If so, then concentrate on the fuel delivery system. Fuel pressure at the test port on the fuel rail should be at least 40 PSI. If not, look at the fuel pump, the pressure regulator, and the fuel filter.
your fuel pressure is suppose to be 60 - 66 psi. first replace fuel filter.and check vacuum line going to fuel pressure regulator.make sure vacuum is going to vacuum line.if changing fuel filter dont help. fuel pump could be faulty.
Check the vacuum hose attached to the fuel pressure regulator under the hood next to your intake pull it off and see if any fuel is present, if there is replace regulator.you may have to tap hose with your finger to get any fuel out or start vehicle run until hot then shut off and recheck if no fuel present in vacuum line let me know and we can try something else.
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump