new sorry if in wrong place my miata stumbles when you first start it any time then when it gets to temp it acts just fine so far i have replaced map sensor isc plugs wires fuel pump and filter don't know what is going on new timing belt checked spark i don't know what else to look at. i need to figure this out i was about to put on a turbo since the outside of the car was almost done please any help would be nice

 

Pump your brakes dude, you've given practically no information. List what you use for engine management.

If this is stock I'd say its your coolant temp sensor at the back of the head.

 

Replace the coolant temperature sensor at the back of the motor.

 

Jeez. Talk about an unreadable post. Capitalization. Punctuation. It works.

Go here to understand how the 1.6 idle works: http://www.miata.net/garage/isc.html

If it won't idle when cold, your Air Valve could be stuck closed. Can't even tell if that's your problem from your post. You should try diagnosis instead of parts replacement, BTW.

Note that I was polite enought to capitalize and punctuate. You owe me.

 

I vote temp sensor on the back of the head. Had the same problem in my car.