my car wont' start!!! help!!!

ok i have a 94 nissan altima and i just bough it a couple weeks ago and we have replaced everything that you could think of when i got the car it was running and we replaced the throttle sensor now it won't start so put the old one back in and yet it still doesn't start if you idle it it will stay on but once u let go of the pedal it's done for...i replaced the mass flow sensor ...oil...spark plugs..checked compression...all the vaccums.....what else could i do i can't drive it to go get diagnostic checked cuz it's not moving .....someone help me i need my car to work!! please!

could it be the ecu? what does that do ? would the car even start if the ecu was fried?

e-mail me if not replyed to this [email protected] someone help!