I've been noticing that my 98 V6 Camaro is getting really bad gas mileage, almost like 150-200 miles a tank, but I've already replaced the Plug Wires, Spark Plugs (Gapped Correctly), K&N Air Filter, and had my Injectors Cleaned. My Dad thinksmy Cat is plugged, but I have a feeling its a bad MAFS.

Any Thoughts?

 

why would you say bad maf?
is your check motor light on?

 

No, It's not on.

 

CAT is a good place to start, air filter or fuel filter is another place to consider.

 

maybe its the lambo doors making wind resistance

 

+1. If you think it's the MAF, go auto parts store, buy some spray cleaner (they make it specifically for this type application), and clean MAF.