Thank you so very much! It is icing here and I will need a few days to get back to work on this particular problem and report the codes.
Now I have another...more immediate one..
I was getting the code PCM P0300 CURRENT. My Mechanic gave it a 100000. mi tune up saying it is multiple misfires. The multiple misfires still happened, he Changed 1 coil bank, for cylinders 8/3. It fixed the problem for 2 days.. then check engine light and misfiring again.
Pulled compression check, and one of the front cylinders had 9 pounds. replaced plugs and restarted the engine.. The car was running normal again. performed another compression check, and all cylinders fine again..
drove the car for 20 miles, ran great.. Now it is back to the misfire problem.. The mechanic says it may be carbon stuck in or on 1 of the valves... he said they would have to pull the heads..
this is scary since I think it may be something else and the head job would cost so much for the 99 Deville..
Any suggestions on this? If it is carbon deposit on the valve, how can I clear it? I m thinking marvel mystery oil or lucus in the gas tank and drive it for a while.. I wonder if that misfire can actually burn a valve if I drive it..
I will say this car has ran great since iv had it for a year and only 92000. miles on it..
Have you ever heard of such a thing? A valve fixing itself? If only for a while?
I am indeed on the funnyfarm and this is driving me crazy when I should be driving it like crazy. These 2 problems the misfires and the stability system. Them Im home free for a while again!
ANY advise would be welcome and I will check back tomorrow evening for any you may have...
Thanks Submariner409!