running rich all of the sudden..........

I have a 86LX converted to mass.Cobra upper and lower,b303,BBK CAI,headers,smog stuff removed and alot of other smaller add ons.
I started the car to take to work yesterday morning and it all of the
sudden was running rich with no power at all. The night before it ran
great. I pulled a code 67 at KOEO and I had codes of 29 and 96 in the continous memory group. I ran out of time last night to do a KOER dump.
I will do this hopefully tonight.
My two questions are the 67 code tells me its a neutral switch issue of
some sort. I did have the car warm and the tranny was in neutral when
I did this test. Will I have to clear this code befroe the computer will give
me another code ? The issue the car is having doesnt seem to be related
to a neutral switch issue. And does anyone have any ideas as to what might
be causing the rich condition ?

Thanks........

Thanks for the reply on this. I didnt do the mass conversion on the car. The previous owner did. Thats been a portion of my problem with troubleshooting anything on this car.
It seems like Im always trying to figure out what he did and why he did it that way. I wasnt aware of holding in the clutch for the KOEO test.
Ill try the test this weekend with the clutch in and see what it tells me.