Boys and girls:
Just picked up my first bimmer. 1990 535 auto. 120,000 miles. Driven by a little old lady (close to Pasadena

. I'm new to this maintenance biz, but I am learning quickly.
The care was freaking filthy - the engine needs a good steam cleaning, I'm told. Interior has been mostly taken care of by me.
My question(s) are - what do I do now? It has a rough idle which is not surprising since she probably never drove over 40mph. I've taken it into the 5500 rpm range, but it still feels rough. I use 91 here in LA. The air filter was just changed, as was the oil.
My first thought is to throw some injector cleaner into the tank next fill-up - Ventil Sauber seems like the popular choice but would others (STP, etc) work? Also, I'm thinking the spark plugs might need changing or adjusting - is that something a newbie like me can do?
What else, fellas?
