idle like crap?

hey everyone I have an 86 GT convertible I am working on and we just put a new fresh motor in it. its speed density ecu ran fine before we did a stock bottem end rebuild with svo heads 1:6 roller rockers pedestal mount edelbrock performer rpm intake stock injectors stock cam. set the timing to 12 degrees initial checked no vacuum leaks. when you rev it up it runs ok but at idle it stumbles and seems like its missing almost like it has a lumpy cam. I did a sweep of the tps however I can not get it to .9 volts lowest I can get it is 1.19 not sure if that will throw it off that much any help or advice would be great I have worked on these my whole life but this one has really got me stumped. has new coolant temp sensor and iac already as well and the computer was opened and checked for damage as well