What is the tps and where is the fuel pressure regulator

Several things come to mind, most common is carbon in and on the throttle body and throttle plate, buy a cheap stiff tooth brush and some throttle body cleaner then remove the filter or tube and have at it until all carbon is gone. Remove then reinstall the TPS because the carbon was holding the throttle (and TPS open) when you installed or reset with carbon it's now "off" that far. Next is a leaking fuel pressure regulator or injector, find the fuel pressure test port and remove the plastic cap. Have someone turn the key off and as soon as the engine is off you depress the schreader valve to release pressure Note the spray. Now restart the engine then turn it off leave it sit until you're sure it won't start then (don't turn key) press the schreader valve if it's about the same not a problem if there's no fuel there you have a leak and if it's an injector it will usually miss at idle and the spark plug should show it after a while it will look "washed" on one side otherwise look at the regulator unplug the vacuum hose there shouldn't be any gas in it then run engine with the vacuum hose to the regulator off there should be no fuel coming from the regulator if there is replace it. I hope this helps. Take Care.

Fuel pressure will have to reduced with a fuel pressure regulator but don't forget ignition timing advance and transmission shift points (if automatic) will be affected if you don't retain the TPS.

Check the ICM. Idle control module. If the fuel pressure regulator was the problem, you'd have a hard start condition ans a lack of power.

Could be a fuel pressure regulator not working. Thus ecu complaining about fuel Pressure. probably not enough because the regulator is worn and leaking down so will not maintain the proper pressure. You will need to google the make model and fuel pressure regulator to find it's location or library and repair manual. Otherwise, you need to measure the pressure and find the spec for the required fuel pressure. Probably somewhere around 120PSI

Check egr and sensor for egr.

If it is fuel injected you may have a bad fuel pressure regulator. The regulator is attached to intake manifold with a vacuum hose and the bladder sometimes fails causing gas to be dumped directly into the intake manifold. Only solution is to replace the fuel pressure regulator.

CHANGE THE FUEL FILTER FIRST..THEN SEE OF THE FUEL PRESSURE TO THE REGULATOR IS THE RIGHT PRESSURE AS THE FUEL PRESSURE REGULATOR ON THESE MODELS DO GO BAD
ALSO CHECK THE TPS TO SEE IF IT IS COMING BACK TO THE START POSITION LET ME KNOW WHAT YOU FIND OUT

The fuel pressure you listed is to low,
The regulator should keep the pressure down to at least 45psi,removing the vacuum from the regulator it should spike to at least 55-60.
Did it start and run better with the hose off?
replace the fuel filter first,then check the pressure again.

Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.

Car won't flood because of the TPS. But it will if the "fuel pressure regulator" is out of range (vacuum line is off?). The TPS is part of the throttle body.