Cold engine RPM's drop

[jorton]

when I crack throttle to leave in the morning. Add a little more throttle and RPM's recover and the car then drives normally. No service engine light.

Vehicle is a 2005 Ford Focus auto trans with 140,000 miles. Most recent work was new plugs and boots that fixed a service engine light, with misfire. I just swabbed the tail pipe and observed very light carbon on a white paper towel(I guess 2 mpg drop is due to using the a/c now.)

Based on these details is there an obvious fix for my cold engine RPM drop?

 

[raytseng]

you can try cleaning the MAF, the throttle body and resetting the ECU (disconnect battery for 10min-or do it while you do the job).
These are easy factors to check first that can affect your idle

 

[eljefino]

I like the MAF idea. You could also have a bum TPS that has a flaky spot just off idle. When warm the other sensors cover for it.

 

[SwampSurvivor]

Have the opposite problem on every ford I have ever had - they always seem to want to idle at 2500+ when cold. 01 Taurus, 01 F350 and current '11 Focus.

 

[jorton]

How long does the engine race like that? Be sure the wheels are straight when you take off!