hesitation during accelleration and cruise
 

I've got a problem that started yesterday in my 03 running a Hydra and begi s5... When I apply partial throttle in most any gear I'm getting hesitation and it randomly is hesitating during cruise.. I plugged up the laptop and it goes rich when it hesitates and then egts drop. Sometimes I can floor it and the car doesn't accellerate at all. Idle is aok. Full throttle is sort of ok-- there's some little bits of hesitation during the rpm sweep there too.

Does this sound like my plugs have gone bad? I only put them in about 7k miles ago... I'm running stock coils.

Sorry if this is elementary. I'm a mechanical noob.

Could be an Easter egg implemented into the code of your hydra ecu. Pretty much screws up your driveability around the time they expect a new firmware release. Guess what, they just had one.

Looks like Samlo1 hit this nail on the head.

https://www.miataturbo.net/forum/showthread.php?t=22588

yes, i'm very excited except that my car will be immobile while jeremy is flashing my rom...

any other ideas about what's wrong with my poor car?

Is the Hydra rom flash helped ? or was it something else ?

Your O2 sensor might be bad or your cat might be getting clogged