I have a open header and it is just until I can ride to go get exhaust....I just did a motor swap (LS) and I can not get it to keep running...I just think its running too rich because of the lack of exhaust, am I right?

BTW I have tried a chipped p28, p05, and a LS ECU with no luck

EDIT: it is a Hytech replica header

 

I just took a peice off of my old exhaust...and crushed it a bit to restrict flow and it really didn't help

 

No.

I went from a stock tiny Y7 manifold with built in cat to a open big tube SMSP and it ran fine. Once you get the exhaust on it you'll notice the change in power. After you get your mystery problem fixed.

 

I worked on a open header ZC circle track car this summer and it ran fine.

Are any of the ECU's you used throwing CEL codes? If your check engine light is on I would get the code(s) fixed.

 

no codes but it was a automatic...and I took out the cams and put manual cams in (slightly larger) and didn't adjust the vavle lash...so I now have the auto cams in and am going to retime it tomorrow (or thursday )

 

i've had open header on my 94 ls for a little over 2 weeks now it runs fine...theres somthing else causing your problem

 

yeah mine ran just fine. its your car.

 

Adjust your valves. You should do that anytime you change out cams.