1972 nova with 1998 ls1

[nova1972]

I have a ls1 that I have put in a 1972 Nova that idles but between 1200 and 2800 RPM is sluggish but anything over that run great and sometimes between 1200 and 2800 it will run fine then all of a sudden it will go back sluggish. Can anyone help me with this. It seemed to run fine with open headers and when I had my exhaust put on is when it started this.

[cuzimoto]

Those intermittants can be a bitch. Sounds like something a faulty MAF will do.

[nova1972]

i have tried 2 maf still runs the same

[cuzimoto]

Looks like we were on the same pags. Can you smoke test for vacuum leaks.

[nova1972]

went over engine abaut 5 times today could not find vacum leaks could it be the computer. i was told 1999 and up would work. i tried two 2001 computer and would not work.

[cuzimoto]

Do you have a data port and are you able to scann or record info