Idling PRoblem! HELP!
 

I have a 1997 Mirage DE coupe with a 1.5L that i recently put a new head gasket in. ever since then, ive been able to let it Idle in neutral great! even in park! but once i put it in a drive gear like Drive, Reverse,1 or 2 it loads up and almost shuts down completely! you cant drive it off because it donsnt have hardly near enough power to get started moving...ive checked all the vacume lines and everything and made sure all of the parts of the wiring harness were plugged in correctly and everything seemed fine...fuses=great...SO, If you have any insight plz let me know ASAP! i need this car for college!