seems like you should get a CEL? hmmm...
OK, if the MAF is unplugged on a working car I think the ECU WILL go in limp mode. So you could try unplugging yours and if there is NO difference - probably the MAF.
Also, you could try resetting your ECU.
Don't overlook the possibility of timing belt being off 1 or 2 teeth - not likely but maybe just coincidental with the bump you took.
let us know what you find out OK?