Hesitation and no CEL

I got an issue maybe someone can give me some light into what to look. The car driver normal for around 20 minutes then it starts with some pretty bad hesitation basically at any speed but stills is normal at idle and no CEL any ideas where should I start? Thanks for the help

 

Do you have a way to data log?

 

Maybe. Anything in particular I should be logging. Sorry I'm just a noob when it comes to logging but thanks for the reply

 

That sounds like a coil pack to me. Is the hesitation present under all forms of driving or especially when you step on it?

Does colder weather help the car run normal longer?

 

If its a coil pack you can probably ohm them out to determine which one, or ones, are different/failing.

 

I thought so too, but I have some coil packs that pass the service manual resistance tests, but cause hesitation and stuttering on acceleration after they heat soak.

 

Did you try a hot water bath (in a baggie) while checking resistances? May help to determine packs failing only when hot.

 

Not a bad idea, however, there is no testing criteria for temperature.

I guess the only way to test it is compare it to known good coil pack. I am going to try this with a heat gun.