2g start up idle/cruise problems

[re-rx7]

Noticed this happening the other day. When i start my car whether it be cold start or warm it will shake/vibrate and the wideband reads off the guage lean. If I let it sit there after about 3-5 minutes idling rough/lean it will rev up on its own and go back to normal fuel trims and everything and i can drive and boost just fine. In this first start up period if i attempt to drive it will bog down and attempt to die unless i floor it then it will bog dwn (lean) and take off after a sec. No part throttle either in this period with out bogging.. If i wait, like mentioned above, it does just fine as long as i dont kill it then it starts all over again.

Really at a loss right now. It was sudden issue. No problems before this.

 

[Sinister96]

Just a shot in the dark here. How does your cooling system work? The FIAV specifically? Seems like the problem is when the engines cold. When gets warm goes away. Maybe your sensor went bad in the TB and is giving a bad signal while engine is running cold fluid.
Like i said a shot in the dark. Do a search on FIAV and ISC an see what you come up with. Also let me know what you came up with and the problem and solution. I'ld liek to know if i was right.