Hello,
If you have already replaced the swirl control valve the first thing I would do is disconnect the vacuum line between the swirl control valve, and the swirl control valve solenoid, and connect a vacuum gauge (like a mighty-vac) to the solenoid.
This will tell you two things:
1. you will know if the solenoid is actuating the valve
2. you will know if there is a vacuum leak between the solenoid and valve.
Next, with the engine off. Disconnect the vacuum line from the solenoid end, and see if there is a leak in the line, and see if sucking the air from the SCV makes the rod for the intake runner flaps to move.
If you have a bore-scope, you can run through the throttle body, and see how the intake flaps are doing. They may be clogged up, broken, missing, or simply stuck open.
Lastly, with the engine running, connect your vacuum gauge to the solenoid, and see if you get changes in vacuum, as this is what should be actuating the SCV.
If you have any other questions, or need more information, let me know, or, if you prefer one of our certified shops diagnose the issue, see the link below: http://repairpal.com/nissan-within-10-miles-of-gordon-wisconsin-54838
I haven't replaced the scv. I replaced the scv solenoid. I don't have a vacuum guage or a scope.. I think the vacuum line is ok. And I did put my finger tips of one hand on the end of the scv and ran the throttle manually with my other hand. I could feel the actuator and valve open at higher RPMs. Now if I reach back and oper the scv with my finger while it's idling it does seem to Change the way it runs. Seems to smooth out. I have also checked the TPS and tested it with a multi meter.. the thing is there I do not get any voltage fluctuations on signal wire when I manually move the throttle. The voltage stayed constant at like 2.4v and it should go up and down in relation to throttle movement..Will the scv problem affect the TPS performance? I don't have any code showing for TPS. I only have the p1130 code showing up.