2002 Nissan Pathfinder Questions

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I replaced the IAC because it would stall at idle. When I put back together the engines idles initially at 1800rpm then once atifreeze temp rises rpms oscillate evedry second between 1500 and 1800 rpms constantly.

2002 nissan pathfinder LE 3.5L 4x4
Radiator fan is not kicking on, and were relay fuse goes has only one post is that normal?

What seems to make the problem better or worse? Nothing
How long have you had this problem? couple weeks
I cleaned the throttle body and replced the IAC module... Attempted to complete the IAC relearn... light never goes to steady but keeps blinking and now the throttle surges at about 1500rpm... makes the vehicle almost in-driveable... Continues to give me P0507 code... vehicle idles at about 1000rpm... The blinking MIL cycles thru 10 slow blinks and 10 fast blinks, but never goes to steady... Help!!!
Added gas and still did not want to start.
I've changed struts, shocks,and lower control arm, and ball joints and iit's still wobbling
Already replaced shocks in back, struts in the front and ball joints.
happens at 70 mph have already replaced shocks and struts
From a dead stop the truck moves forward but the tac will shoot up like its disengaging somehow? Any ideas?
When I start my car It is making squeaky noise for a minute and it stops. It comes back after a while.
But I hit it and it died and won't start any suggestions
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