4A-GE MK1 Engine engine hesitates [Archive] - Toyota MR2 Message Board

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I have a 1989 toyota mr2 that hesitates past 2500 rpm. it starts okay and is okay when idle. I tried changing the spark plugs, airfilter, oil filter, fuel filter so far. Also did an engine flush to clear it up, but I dont know whats going on? can anyone help? when I press on the Gas, the check engine light comes on....and it hesitates, like its about to die, but it doesnt... I also checked if the fuel pump was working and it seems to be fine, has anyone had this problem? How can I fix it?