Ok since I have done the na t conversion I have been getting the engine light on which is showing code 31 which is the map sensor prior to the conversion the car was running sweet is there any chance that the plugwhen the engine was put back in that the vacuum pipes got put on the wrong way i didn’t do this myself I had a professional mechanic do it of which I have trusted for over 20years, the car starts on the button but when warm it doesn’t like it at all it runs rich and after a while it cuts out and won’t idle, I am going to try another map sensor on it to see if that is the problem other than that I am stumped. Has anyone had this problem with there na t build. I have found old posts and have tried contacting them but nothing as yet maybe they aren’t on here anymore??? The only thing I have changed in the conversion is th fuel pump walbro 255lph ,it still has stock injectors. I have also checked the voltage going to the plug from the ecu which supplies the map sensor and it’s a good 4.5 volts .