okay i have posted a similar problem before but today when i drove to work a few minutes after driving it started chugging and cutting out...then after a few minutes of barely keeping up with traffic boom..it was working perfectly fine. optispark problem maybe? i know it isnt the maf and isnt the o2's so what do yall think?

 

If you have spark at the plug then it's probably not your opti.

Check and make sure you have inkector pulses?

 

lol... i have the SAME problem with my car.. it always happens around the same temp (170*) and when it warms up, it drives fine. in my case it isnt the injectors because those are new, so idk.. maybe opti? maybe IAC? im changing the IAC soon so ill keep you updated if it helps, maybe itll help your situation..

 

Check fuel pressure, change filter.

 

yeah its everytime almost at the same part of the highway on my way to work.lol idk but i do plan on changing my fuel filter soon and just put a new 255 pump and new injectors in the past two weeks. i will try to check my pressure too i had the same problem with the stock pump so i am pretty sure it is not it.weird thing is i had no problem today with nothing different done to it. past weeks been an everyday day thing to and back from work

 

oh and ofcourse it didnt do it the day that i datalogged it lol

 

You cannot go by just looking for spark, I had problems once where it would not start, it just cranked over and had a little back fire in the intake, (you could barely hear it) I pulled #1 plug wire off and tested the spark against the compression stroke and it seemed perfect, I scanned it and got a Lo resolution code which is the opti, Installed a Dyna Spark and all was good..

 

was it raining? i was having that problem with my opti in wet weather.