System too lean
#13
RE: System too lean
Remove the plastic engine shield by turning the plastic fastener that hold it on and just do a visual check. The lines tend to break at their connections. Make sure nothing is loose. A tiny nick in a line will set that code. By the sound if it form you clearing the code and it comes right back if there is a broken line somewhere it should be easy to find. I am not saying its not a MAF or something else I just think you should do the easy and less expensive options first.
#18
RE: System too lean
When it was my one of my vacuum tubes, before I knew it was that I cleared the codes and it took a little while for the cel to come back on. I found what tube it was by hearing the leak and looking for where the sound was coming from.