Motor seems to run ok but the engine check light comes one and stays on for long period of time then goes out. I pulled the codes and really not want to just start replacing parts. Can any one help? The car has a stock L98 350 W/auto trans.
Codes:
12
13
33
36
44

Now these codes show a lean running motor I thing. But it seem to be using to much fuel.

 

Boffalo,

Your signature shows a 1982, but you're listing an L98. What year is the car/engine in question? It makes a difference for code diagnosis.

 

This car is a 1989 Firebird Formula 350 I just got 2 weeks ago. I worked on it today and got the problem solved.