flashing check engine light (after full acceleration from a stop)

[bjorkmae]

YEsterday upon full acceleration from a stop up to 65mph with the ac on in 90 degree heat my check engine light started flashing. I shut the car off and it repeated the flashing check engine light later under identical conditions. I got home and I had 5 codes. 3 were for a random missfire and 2 were related to the transmission control. I think the transmission codes were a result of the missfire as the transmission doesn't slip and the fluid is perfect. Car has 58k miles. The car had a full tune up with the best napa wires + plugs, and new timing belt and tentioner about 3k miles ago. But it has always had a very slightly rough idle, like barely noticeable. Since the plugs and wires shouldn't be the issue I went ahead and ordered a new ignition coil since a search here indicated it could be the problem. I also know ignition coils can be damaged by heat and it was hot and the under hood temps were high. Does this sound likely to anyone else or did I just waste $86 on a coil?

[petrified.rabbit]

it could be the coil. but if that does not fix it, i would look into the timing again. The rough idle issue sounds like you might be a tooth off..and under full throttle the issue develops at the higher rpm.

[bjorkmae]

yeah I will have to if it continues. The interesting thing is that it had the slight rough idle issue when I got it before I did the timing belt. Another interesting thing is that it doesn't always have the slight rough idle. Like half the time. I checked and the old belt hadn't skipped a tooth before I took it off.

[paulsaveo]

From my experience, my flashing engine light was from a bad coil causing a multiple cylinder misfire which resulted in a bad a/f sensor and also killed the catalytic converter. also in my experince as far as a rough idle goes, i replaced the iac which helped a little, I ended up removing the throttle body and cleaned really well which took care of the rough idle. Ive got an 04 aveo hatchback