P0302, the fun never stops with this car.
I had this code earlier in the year, and they replaced my coil in #2. It was all melted. We replaced the spark plugs with OEM's, cleaned the MAF as well.
CEL was off, but the rough idle was there. Everyone said check for a leak. Eventually I got a P0171 and ran a smoke test. BPV leak. I purchased a new gasket and some RTV sealer, and thought I was done with it as of yesterday.
I let the RTV cure. I take it for a spin, and still have the CEL. I figured it was vacuum related and the ECU would adjust it self. Today I get the P0302 while pulling in to a parking spot. So I have no REAL idea if the BPV gasket worked or not, so I can't rule out a vacuum leak unless I smoke test or something again. But the code was a no show.
BUT as the P0302 was in play (I guess that's how you'd refer to it), my idle dropped from 1k to almost half. 1k is ok, but still missfires. When it hit half, I knew something was wrong. This thing sounded and felt like it wanted to die. Just as it smoothed out, the CEL came on. It seems to run better (but still bad) with the CEL on, than it did before the P0302 code. If that makes sense.
I'm taking the car in tomorrow. Anything specifically I should mention aside from having new plugs and coil on #2?