metalmelitia36

I did the ka24de swap on my 90 coupe I hooked up all the wiring,grounds,vacuum lines, fuel lines etc. the engine runs for a few seconds fine n then it slowly shuts down like it struggles to stay on. I can't figure out the problem it's driving me crazy. I checked all the vacuum lines just to make sure I didn't miss one. But it starts right up no problems n I have to press the gas pedal to keep it going when it's dying down. Any help or idea I would appreciate it thanks.