For a while now my car has been throwing Code 44(which is Left O2 running Lean)

Oh this is a 95 Trans Am

Well ive switched and replaced both O2s...still throwing same code. So im guessing something else is causing the left bank to run lean. When I threw in a new O2 just now and turned the car on, the Scanmaster was showing LBL at 160 and RBL at 128(what its supposed to be)...

Any other ideas on what it can be? I replaced plugs last week and wires a few months ago...Opti is also only a few months old.

I took it to two shops, but they said since I have a MSD Igntion, they cant tell whats up. So im stuck on my own...

 

You probably have an exhaust leak on that lean side.

 

I dealt with that code before on my Z that I recently sold, very aggrivating. The car had MAC headers with the removable front header tube, I tightened the clamp as tight as it would go and still no luck. Bought a new exhaust clamp, put it on as tight as I could get it, fixed the problem.
My O2 was showing lean on that side setting a code due to sucking in un-metered air by that header tube leak.
My BLM's were reading wacky before that repair also. You shouldnt be seeing your BLM at L 160 - R 128 at idle.