I have a 91 civic with a 1.5 liter and an automatic. It has an intermittent problem with the engine bogging down and idling rough. The fuel system has been gone through, replaced the pump and filter, checked the fuel relay, good, and swapped the throttle body for one of the same year make and model. The entire exhaust, from the manifold back has been replaced, to eliminate the cat from the equation. The problem is not consistent. One minute it's running fine and the next it's trying to die or has no power. Sometimes the check engine light comes on sometimes it doesn't. If it comes on it seems to clear up for a while. I haven't been able to check the codes when it happens yet, so I don't know if it's holding a code for a problem. If anyone has had a similar problem or has any suggestions they would be greatly appreciated.
Thanks,
Daniel