2002 Mercury Optimax Takes forever to start!

[thetatumtoo]

This just started. When the motor is running, it runs great. The motor used to start right away with no problem.
I have:
New fuel lines
new fuel filers
VST tank has been completely cleaned
I hear both fuel pumps running when i turn the key
The battery voltage is good and leads are clean
new plugs
I dont see or smell any fuel leaking

When I go to start the motor it takes at least 1-2 mins to start. when it runs it has no problems. As I am trying to start, the motor gives me a burp here and there and the eventually starts. this just started happening out of the blue. Any ideas?

Here is a link to a youtube video so you can hear it. The video shows it starting but I am usually not this lucky.
THE LINK IS A GOOD LINK TO YOUTUBE. It is not spam. I could use some help here. Thank you!

https://youtu.be/uArNMrRnHVI

 

[yzf125]

Could be dirty injectors, I have heard running some sea foam works or before you do that, look into how to clean dirty injectors and what to use.

 

[enginepower]

So even on fuel injected, does the choke button play a part in starting when cold? If so, maybe the ECU is not getting the signal. Possible regulator issue? Have you checked the fuel pressure? From your video, sounds like it's firing at the wrong time but I think lean on a 2 stroke can cause a similar issue.

 

[Faztbullet]

EFI and DFI engines do not have a choke and pushing in the key does nothing...A sticking tracker valve on fuel rail, air/fuel pressure off, ring in air compressor bad, fuel pressure regulator stuck....