An issue I thought I resolved with a throttle body cleaning has recently started to come back: on cold starts, once the starter disengages, I can feel the engine really struggle to get up to normal RPMs. Last time I had this issue, it was so bad the starter kept cutting back in to help out. Seemed to go away with a throttle body cleaning about 6 months ago, but over the past few weeks it seems it has gradually come back. It seems to struggle for a couple seconds before it revs up and doesn't do it when warm.

Don't think the throttle can get that gunked up in only 6 months, can it? I cleaned it out pretty thoroughly, front and back of the plate. Only other thing I can think of is that the spark plugs are due for replacement soon (95k miles, they are likely original).

May or may not be related...my idle is a little lumpy and I've got a strange vibration at 1100 rpms that I haven't figured out yet.

No warnings or lights on the dash. Pulls strongly.

 

I would check for vacuum leaks first and clean your MAF sensor while you're at it.

 

>any codes?
>clean MAF
>check that engine air filter is not gunked up to hell

I did plugs at 103k they were fine, a bit dirty, minor valve cover leak but otherwise ok

 

Clean the throttle body