changed intake manifold and valve cover gaskets now runs rough

I took my time and replaced intake manifold gaskets and valve cover gaskets. Well I got everything put back together and the car runs really rough. I let it run for 10 minutes and there is a puddle of oil under the car from the passenger valve cover It must of not seated properly. I don't know where to start with it running rough. Everything is hooked up right. When I first start it it seems to run good then all of the sudden it idles at 200-300 rpm. What do you guys think

Start with taking it back apart on the passager side check both seals... most likely u need to change the inner seals if you didnt do them... if you didnt change inner seals when you changed valve cover gaskets then it was no point n changin them. the inner seals are the main point of changin them.. Take them back off take some sand paper and clean the gasket seat. make sure nothings n that crack.... then after then take some red gaskets seal and run it inside the crack. u dont need alot just a small line thru the whole thing... then put the gasket back in let it set for a couple of sec. then install valve cover.. start with the one outer top screw first. dont tightin it all the way down yet tho. Go in a X pattern ok. and after all screws in. slowly put everything back together.

I can get the valve covers fixed but I don't know why its running rough. IM pretty sure intake is on right. vaccum lines on. Only thing I noticed I didn't hooks up was intake silencer but I don't think that would make it run really rough

Did you check spark plugs and it could be o2 sensor.. or fuel filter...

car ran great before I did this.

You have to take it apart again. Something is not right. Make sure you have a Bentley manual for it.

Sent from my DROID4 using Bimmer App

I took to a shop. They said the valve cover and some clips were missing from the injector. I guess it wasntsnt getting s good connection. Ill know more monday.

Did you get any codes like misfire codes maybe?

shop told the code came up with something to do with cylinder 7. I guess there wasn't a good connection to the spark plug. I don't see how a couple injector clips could cause a problem.

Could be the coil or fuel injector wiring harness not seated properly on fuel injector resulting in a huge misfire because its not firing (no spark to that cylinder).