Help diagnosing engine hesitation

[emi325i]

Both my car and my brother's car (325i, 5 spd), hesitate slightly when the engine is cold (well, it was 70F out this morning). It'll start fine, idle perfectly, but the first time I get on the gas it hesitates for a second before it takes off. It will do that once, and behave perfectly after that. I also noticed that occasionally it also takes a few cranks to start.

A week ago I cleaned the AFM because it was sticking a bit. the idle valve is about a year old. I can hear the TPS click as the TB closes. I sprayed carb cleaner around the intake boot and vacuum lines and found no vacuum leaks.

What else am I missing?

[MattE30]

It probably wouldn't hurt to change your plugs, wires, and distributor cap and rotor. When were they changed last?

[Garageaholic]

It probably wouldn't hurt to change your plugs, wires, and distributor cap and rotor. When were they changed last?

That's exactly what I was thinking...

It'll get harder and harder to start until it just doesn't start at all one day. Do it NOW (arnold schwarzenegger voice)

[emi325i]

i replaced the plugs about a month ago. All ignition parts are about a year old. I also replaced the injectors about a year ago.

[Garageaholic]

Dirty throttle body, AFM door sticking? Have you checked your air filter... or even your gasoline filter?

[CorvallisBMW]

My car does this too when it's cold out (below 50 or so) and it never gets any worse over time. It's been going on for years, just a bit of an annoyance. I've changed every part on that car, nothing made a difference. The only thing that made it slightly better was putting the OEM chip back in. IMHO I wouldn't worry about it.

[emi325i]

I cleaned the throttle body. AFM door was sticking but i cleaned it and it is now opening/closing properly. Fuel filter is new as well. I guess I forgot to mention a few things. I ran seafoam about 5-10k miles ago.