WTF up with my car??

[Tree]

so my check engine light came on lastnight.. and i was driving like an old women... so i was not my way to work, and i just started to car and it was not on, i started to drive and when the car heated up the light came on again. i got about 10 min in to my drive i was going about 60, and the car bucked.. it felt like.. or it felt like i was running out of gas... or the motor was again to shut off. so it kept on doing that.. i got to work, the car just shut off. so went came back out and try to start the car. it just turn over... so i push the gas alittle and it acted like it would start like it would start then would not go over 500 or less rpms.. it did that about 6 time then i gave up. its a jdm motor swap a dohc zc, when i got it i had to replace the map sensor. what could it be??