Vehicle will not start @ all!

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

The link explains how to test for vacuum leaks.

The air hose is the one between the air cleaner and throttle body. Check for cracks on the hose or its connection.

Vaccum leakages can cause high idling and misfirings and you should try to get this rectified first. Forget about what people telling what it could be and to check this and that. You need to follow proper procedures for diagnosing problems and not guessing on prossibilities. I only work on information you provide so if I get the wrong data, you are going to get the wrong answer.

Get a can of carb cleaner and after starting engine, spray a little the carb cleaner around suspected vacuum leakages and if the engine idling changes, that is the area you should be looking for leaks.

Do not over spray and concentrate on one small area at a time, with short spurts.

Injectors are at intake manifolds, attacheed to the fuel rails and not directly visible.

Recheck your work. Something could have not been plugged in correctly or loose.
Get a scan done to check for trouble codes. Most parts stores provides free scanning servies. DO NOT change anything first, just let us know the trouble code is fany found.

I don't go around guessing, we need to diagnose the problem and remember, you are our eyes so what you give us is what we are working on.

We are here to back you up so if you have any questions, don't hesitate to ask.

I have this to suggest, forget everything that had occurred and we start from new. Sometimes problems are resolved and a new one comes up due to something else and we tend to overlook those that we have worked through.

We restart from zero and the basics.

1. List out the symptoms presently showing.
2. Check for trouble codes.

If you want to do things yourself and needs our assistance, you need to follow instructions acccordingy. If you want to listen to what others can offer, let me know so I can opt out.

You don't seem to be following what I have suggested. This started from the beginning and I had already told you what to do and have you done those?
Check starter, battery and terminal connections.

This means the starter is not in good condition and might need repair/replacement.

As to the running issues, get the codes read again and see if there are none, you need to check the idle control system which. Have you found the air leak (vacuum noise)?

You need to get the engine running first before you are able to get it to run properly. If the starter cranks intermittently, it usually means the carbon brushes are running low and the knock of the starter can only work for a short period of time before it completely fails. Unless you have the knowhow, tools and parts to perform repairs the only thing you can do is replace it.

The big hose is the air hose I refered to. If any part of it is leaking, you would have running issues.

You mentioned the throttle body being dirty, you would need to clean it up as a dirty throttle body would affect the idling.