Well today I started my car(it had been sitting for a day or so) and the engine ran really rough, only on 5 clylinders I think. I unplugged the coils one by one and the #4(middle rear bank) cylinder appears to be bad. I just figured it was the coil, but later after driving around, the problem got better and almost went away. Another thing that has been happening is that on a cold start the rpm's will shoot up to 2K, but then drop to normal quickly. This has been happening for awhile. Is this an injector problem, maybe a leaky one? I havent checked them yet, but will do so as soon as I can. Any help is appreciated! Thanks!

 

Pull your coil and inspect it for cracks/damage first before replacing it.
It would not be unheard of for an injector to go bad.
The cold start RPM is not a problem per say more of a glitch that some of these cars have.
You aren't the first to have a high cold idle speed.

 

Got the high idle on cold start- up, but she runs fine as soon as it drops.

 

try checking maf...i had same problem and bought a new maf and car runs fine now....try taping on the maf while it is running...if it cuts out then its bad...you could also try turning the car off..unplug the maf sensor..if it runs good with it unplugged your problem is found...then turn car off and reconnect..if runs ****ty then you konw its bad...hopefully this will help a little bit