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Hey I got a 91' Accord EX 4Dr and having the same problems, car runs kinda rough until CEL comes on then it runs a lil' better and i can hear like a hissing noise when at high RPMs, Checked code and it blinked 43?
If the only code is the 43 from the cel. You can test or just replace the O2. I'd aslo ask how the normal tune up items are - are the plugs, cap rotor up to date?