My engine is hard to start?

It sounds like one of three things, a weak fuel pump, plugged fuel filter, or leak in the fuel system. What you need to do is check the fuel pump pressure at the fuel rail. Pay special attention to how quickly the pressure drops off.

Let me know what you find.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

NOTE: You will need a pressure gauge. Most parts stores will lend or rent them.

Let me know if you have other questions.
Joe

Check fuel pressure with a gauge should be 60-66 psi key on only. if lower that is your problem. then scan for codes if that does not fix it. auto parts rent gauge a lot of times pump gets hot and weak. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Mass air flow, or MAP sensors will also cause this, MAF especially if you have modified air filter installed. Throttlebody has been cleaned? You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!

Sounds like a fuel pump. Have the pressure checked to verify before throwing part at it.

Pumping the accelarator pedal does nothing to help it start

Roy

The pump may run for 2 seconds with key on.

Pedal work with it running, obviously.

Pumps can be intermittent. Thats why you need to confrm first with an actual test

Roy

Good luck

Recheck to make sure you haven't disconnected any vacuum hoses. If you removed every thing, it will be difficult for me to help identify the problem.