I have a really weird problem. My CEL comes on when I am driving, the weird part is only between 1500 and 1800 RPM.If i am driving at this RPM for more than 2 secs the light will come on. If I take my foot off the gas and the RPMs drop below 1000 it goes off. It is not throwing any codes at all when it comes on. The only recent thing I have done is change the dizzy. It also will not replicate this fault unless I am moving. Any IDEAS ANYONE.

1991 Civic DX w/ZC swap