Well, I guess I'll should give you a little background. USAF and just moved to Germany from South Korea. I bought her about three weeks ago, and she acted fine at first. Stock from the looks of her, DOHC D16Z5. I'm getting about 20 mpg and now idles irratically between 1k to 2k and never really settles. I replaced the spark plugs, but the only available plugs they had on base were some frech crap I have never heard of. The old ones were still gaped correctly just had a bit of carbon on them. I kept them just in case. I imediately chaged the oil and check the air filter (almost brand new), and ran some fuel injector cleaner, but alas no luck. Not sure what its sounds like when the engine is miss firing but engine exhaust stutters after pushing on the gas and letting off. I checked all the hoses for leaks but didn't find any. I pulled out the PCV valve and it was coated with oil build up. It still operated but not sure if that is normal. Well any help/advice is really appreciated. I don't really have the money to have a mechanic give her the once over, but if anyone can narrow it down for me it would really help. I planning on getting married in denmark ASAP so money is a little tight.