Hi,
I've a '93 1.8 eunos roadster that idles roughly and stumbles after warming up. When on the open road she seems to have loads of power but as I haven't driven another one I've nothing to compare it with.
I've already replaced the plugs and leads which made no difference. Also I've been putting redex petrol treatment in the fuel and into the injectors in case they're blocked. Still no difference.
I did the old paper clip trick on the diagnostics thingy and checked the readings with a volt meter. There were a couple of errors there initially (1 and 8) probably because I was dicking about with the air flow monitor to get the redex into the injectors.
I cleared the diagnostics by disconnecting the battery and took the car for a spin. Now all the error codes have gone but the rough idle/stumble is still there.
I'm not too sure what else to try. Things I've thought of trying but am not sure if they'll make the difference are giving her a new air filter or fuel filter. Or could it be the coils breaking down. I'm not sure which of these things would be picked up by the diagnostics computer anyways. I'm a bit worried that the longer I leave it, the more likely I could be doing damage to the cat as unburnt petrol may be getting exhausted.
All help greatly appreciated. Gav.