could that happened randomly like 1 day and not for another week or month?
Yes. Unfortunately some problems are intermittent.
Might add I put up with a P0430 from my Boxster for a few years, the only code the car ever produced during that time. Didn't change the fact a converter was bad -- and intermittently bad (loose in its housing). For months the error would not appear then it would. I found a change in gasoline -- switching from a discount brand to using Shell V-Power -- cut down on the frequency of the appearance of the CEL/error but didn't keep it at bay entirely.The knocking from the converter when cold and the buzzing from it when hot finally got to me and I replaced both exhaust manifolds. CEL remained dark. Error gone. Noises gone.
I do that every morning I let it idle until the RPM drops
The absence of any issues from a cold start and idle does not take a lifter (or two) off the list of possible explanations but it does drop the possibility down a place or two. Maybe.
the only code ive had is P0320 for the past 2 yrs
P0320 or P0302? Big difference. P0320: Ignition/Distributor Engine Speed Input Circuit. P0302: Cylinder 2 misfire detected.
Are you checking for any pending error codes?
I used seafoam in the tank
I have no experience with Seafoam. I have experience with Techron and if something that one can add to the gas tank can help Techron is the stuff to use.
Yes I use Mobil 1 euro 0w40 only
That is a good oil in spite of its bad press. My Boxster collected most of its 309K+ miles running that stuff. If it was bad oil I'd know it. But I did and do change the oil every 5K miles.
im guilty of that I was running the oild for 10k then chaging it. that's what the dealership told me.
10K miles is pushing it unless you spend a lot of time on the freeway. I've driven 5K miles over a week's time with fresh oil and then draining the oil afterwards and noting the oil still had some amber color to it. I might not have any hesitation in driving the car maybe another 5K miles -- on the highway -- but since my usage doesn't involve 10K mile road trips I change the oil every 5K miles.
Ok ill make a note and get it at the store for this weekend.
Just so you know. This is what I'm talking about
My Porsche tech buddies tell me this helps quiet engines that are used infrequently but can help with reluctant VarioCam Plus high/low lift hardware, although I grant you that as a cause has not been determined. Doesn't cost much to try it. Shake the bottles good before you dump their contents in the oil filler tube.