https://youtube.com/shorts/75OqWJURGXs?feature=share

Hi Eg/eh friends. My eh2, recently b18c1 swapped running on a stock p72. As you mightve noticed in the noisy video, I'm having some trouble getting it started and staying running. It's an obd2 motor converted to obd1. I've wired in vtec and knock sensor all that good stuff. I know it might sound dumb but what could be the problem? It almost seems like it's not getting enough fuel to keep running? Currently showing code 14 (iacv/vacuum leak) and code 41 (heater circuit malfunction?) Could it just be that vacuum leak? Any input is much appreciated.
I should also add that the b18 was in a car and test driven before I bought it and everything worked perfect. So I'm guessing I messed something up (hopefully not badly) or hopefully I'm just missing something or overlooking something. Thank you in advance!

 

Likely vacuum leaks...or several small ones. O2 Sensor malfunctioning will also not help the cause.

Time to trace all the hoses and check out why you have IAC and O2 sensor issues.

That's where I would start..

 

I'd definitely find the vacuum leaks first, and yeah check the O2 sensor.

 

Based on the video, I don't think it's a vacuum leak. Make sure you do not have some plugs switched around. IACV and IAT can be accidentally swapped, as well as MAP and TPS.