in the engine bay think its top right, cant for the life of me remember

but there is a small black box, lift the flap type thing and connect terminals TE1 and E1 with a paper clip

(engine turned off).

.

.

this will flash up a light on the dash.

if there is a problem is will flash e.g.

5 blinks.

.

.

pause.

.

.

2 blinks, that would indicate the knock sensor.

if there isn't any sensor problems going to the ecu it will just flash continuously

(indicating no faults)

here is a link:
http://www.btinternet.com/~netsurf/mr2t/mr2tfaq.html

scrol about half way down and it gives the codes

could be a cruddy fuel filter, weak fuel pump.

.

.

how old are your plugs, leads, dizzy/rota arm?

could be any number of things lol, but do the simple ones first