Random Rough Idle

[Power-Glide]

Recently I've noticed my car will idle really rough(like it's cammed like a race motor) randomly... To give you an Idea I drove to my local parts store, which is a 10min. drive without any issues - the engine was cold when I started driving. The after like 5 mins. in the store I leave and head home, and at the second stop light it really started to rough up on idle.... I pull away, no problems? Then at the last stop it did it again and kinda surged under normal driving for 10 secs. then no more! WTF? MAP is good, TB was just cleaned, coil was changed, motor was just put in with 30,000km's on it, brand new fuel pump and tomorrow I'll do an idle re learn. I'm miffed - btw this car idles so smooth I'd almost think it stalled at most stop lights - help me out!

 

Any ideas?

[Slade901]

Idle Re-lean is a good idea.

 

Next, check or probably the IAC is failing.