hey guys..i have a 98 2.2l auto circle track car...i just put the motor in it and when i go to rev it up it cuts out and starts poppin and crakin but if you give it more gas it smooths out and runs good..i dont have the mass air flow sensor plugged in cause i dont have the stock intake tube on it..could this be the problem?? plz let me know asap i need to get it ready befor wednesday!!

THANKS!