Cant Figure out what is wrong!!!

[SimpleEnigma]

Lately my 92 coupe has been running really rich, goes through gas fastern than a blown 454. i know that leads to a lot of problems, mainly gumming up of valve seats and residue on the spark plugs, which only makes it worse...anyway...i pulled the ECU and checked the trouble codes...the only one i got was 55 - everything's ok, but everything is not ok. I am wondering what it may be....when i went to Mode II with the engine on to check the EGR function...the light blinked erratically, staying on for a few seconds, then blinking real quick then staying off for a few seconds. I am wondering if you guys have any ideas as to what may be causing the problem, because now i am having stalling problems.

PCV valve maybe? or EGR is shot? bad fuel injector? oil change? or maybe i need to take it somewhere to get it scanned.

[hachibroku]

check your o2 sensors they will cause gas mileage to decrease.

[SimpleEnigma]

if i pull the O2 sensor what am i looking for since the ECU didnt register and O2 sensor malfunction?

[The Mic]

try cleaning your AIV too.

[navysnail]

its gona be more then your pcv valve and an oil change, although those are not a bad idea. i would recomend checking the coolant temp sensor, fuel injectors (pull spark plugs, see if any one of them is covered in gas), check the maf and it's ground.