Well, a code 43 is telling you that you have multiple misfires. The code 27 is a problem with your fuel injectors. Given this and the fact that you smell gas, I would suspect a gas leak at the fuel rail or in the line. Interrupted fuel supply would certianly cause a misfire.
Cross-threaded spark plug.
2.2 or 3.5 engine info needed along with codes and which 2 cylinders are misfiring.
P0422 talks about catalyst efficiency. P0300 is random multiple misfires. http://www.troublecodes.net/OBD2/Pcodes.shtml
There are hundreds, if not thousands of possible codes.
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P0300 is for random engine misfire p0301 and p0305 are misfires on cylinders # 1 and #5 www.lextechautomotivellc.com
I received these error codes for my 1998 Dodge Avenger, 6cyl. 2.5 What does these codes mean? Where would I start to fix these issues? ~THANK YOU ~ P0108 P1297 P0401
Engine misfires. P0300 corresponds to misfires that are random among all cylinders, whereas P0301-P0306 correspond to specific cylinders. I'm not an expert, but other posts I have read seem to suggest that because you are getting misfires across more than one cylinder, it's probably something like your ignition coil, distributor, etc. !
With a scan tool.
Google OBD codes
See link below for a list of OBDII trouble codes.