1998 Mitsu Eclipse Manual engine turns but won't start until gas pedal engage?

[Just an opinion...]

Hey I just dropped in a different engine for my 1998 Mitsubishi Eclipse 5-speed manual and when I go to turn it on, it will turn over but won't start UNTIL I engage the gas pedal.
I've been researching online but no one really has a concrete solution. Can anyone provide me with some feedback.