Happy October to all,

I have a pretty much stock 1.5 in a 1991 civic, equiped with a header. I runn this in ITC thru the SCCA.
I posted before on a stumbling problem I have with the car.
I put the car on a mustang dyno at Wheel to Wheel in Michigan. Car starts up and idles real rich-9's and low 10's for A/F ratio. It runs in the high 10's and low 11's at WOT.
Question is, how can I lean this car out with stock parts and or what would cause this car to run that rich? :119:
Thanks in advance to any info!

Devin ( in need of help)