Codes came back...

[Starter986]

Last week threw codes 1124 and 1126. Did a fair amount of reading on a few forums, so I'm not entirely ignorant about which corrective steps to take. I just need some guidance on the next steps towards remedying the situation.

Installed new fuel cap.

Checked and vacuumed air filter.

Cleaned MAF.

Examined AOS J-tube. No oil.

Checked oil-cap pressure, engine running. Not terribly difficult to remove... little suction... obvious suction sound. When I removed the cap the Rs dropped... then came back up a bit. Reinstalled oil cap... normal Rs.

Didn't hear any hissing from the engine compartment. Cursory hose/line examination revealed nothing extraordinary.

Filled it 3/4 fuel.

Closed it back up... cleared the codes. That was Saturday.

Today I took her for a short run, and up to temperature. Notice zero performance challenges... seems to be running as usual. No codes thrown. Got home... connected the OBD... and 1124 and 1126 returned... with a new code 0150. Did some reading... and here I am.

Now... last week when the codes threw I did pull from my OBD some information (today that information is absent... maybe because it hasnt yet thrown any CEL codes. They're just resident). The extra information from last week is:

Frame 1
Engine speed 798 RPM
Calc load 1.2%
Coolant 189 degrees
ST FTRM1 1.0%
ST FTRM2 0.08%

Frame 2
LT FTRM1 1.6%
LT FTRM2 0.0%
Vehicle speed 0 MPH
Fuel system 1 closed
Fuel system 2 closed

I phoned the local indy... and a smoke test will run me $90-$180.

Saw the cigar smoke test vid. Would that work? To which vacuum hose would I introduce the smoke? The vid illustrated blowing the smoke into the pipe.

Are there any other non-electrical, vacuum, etc. tests I should consider before going the "paid" smoke route?

These are the first codes the car has thrown in the 1 year I've owned the car. If anyone has some insight or direction... greatly it would be appreciated.

I've a new AOS waiting to be self-installed (along with the new WP, thermo, tubes, plugs, coils, etc.), just waiting for cooler weather.

Thank you.