2004 V70 5speed non-turbo 225kmi. Misfiring, throwing the 0300 code. The car has about 3/4 tank of gas, and the weather was in the 30's a few days, then went into the 90's with extreme humidity for a few days. I thought maybe it was condensation causing the misfire, but with todays fascist gas being 10% ethanol I didnt think moisture was a big issue anymore? But I added a bottle of drygas just in case. Didnt help. I have drivin about 10 miles hoping it is going to cure itself, but it hasnt yet. I just got out on the highway, and found the engine will run ok, but with a skip. I get up to 65mph then the throttle stops responding and the rpms stick at 3000, and the car loses speed. I found that if I turn the ignition off while driving, then back on(not the safest thing to do while on the highway I know), it will let the throttle again be responsive. I know the common causes are the coil packs cracking and the camshaft sensor going bad. I figured it might be bad gas, but now I suspect its something else. Why would it throw just the 0300 code if it is not a specific coil pack that went bad? I had an issue a couple of years ago on this car throwing 0303 and 0305 codes, I switched around some coil packs with no change, and I fixed that issue by installing a new fuel pressure sensor. I can put a new camshaft sensor on now, but I am hoping one of you Volvo gurus might have some ideas on the best way to attack this issue.