Anyone have any suggestions for me to try. I have a 550 fuel injected here and it simply wont idle. It will start and if I give it gas will run but if I let off gas it just dies off. And sometimes even with giving it gas it just shuts down.

It kind of idles down and shuts off, like its not getting fuel.

No error codes on screen.
The TPS checks in range.

Starts up pretty good.

I’m thinking I have to check fuel pressure next but would appreciate any suggestions. I changed the plug a few weeks ago could it be fouled out already?