Rough idle issues?

Hi Ken, I found that I had a small air leak at the manifold to converter flange on bank1 side right before the o2 sensor. In the process now of replacing the gasket. Fingers crossed this is the problem. If not, I’ll send a video of the car running.

I’m struggling to remove the nuts on exhaust flange. I’m dealing with rounded off nuts from previous owners/work that was done. I managed to remove the top one. Second one I couldn’t even get the 15mm socket to work. I removed the starter hoping to get more access. It’s all but impossible to get good leverage. I tried using my bolt/nut extractor but again I don’t have much room to pound it on. I’ve broke two of my universal adapters and I’m kind of at a loss. I’m adding a picture of what I’m dealing with. Any ideas?

Hi Ken, just wanted to give you an update on my car. After finally finishing my exhaust leak issue, I no longer have the p2195 code! However after letting the car idle for 10-15min for computer to do its thing, the rough idle is still there and know have a p0171 code. Fuel trims confirm that with bank1 still around 30% at an idle. When rpm’s go up fuels trims come down. I’ve tried the carb cleaner trick by spraying vacuum line and hoses around the bank1 side and can’t find anything changing the idle. I’ve read and seen where you can unplug the maf sensor with car running, which did change the idle but both banks fuel trims maxed at 32%. When I plugged the sensor back in the car died. Now, people say this can reflect a bad maf sensor. I tried cleaning my sensor with the correct maf sensor cleaner and no change in cars idle issue. I’m worried that this issue is leaning towards the intake manifold because it’s the only thing I haven’t looked into. Any thoughts or where to go next? Or how to check the manifold?

I replaced my MAF sensor. I had the battery unhooked over night. Car seemed to run better so went for a drive. Ended up being 30min. I did have the ac on so extra load on engine but still seemed ok. Got to my destination turned off ac and noticed rough again. Once we left to head home check engine light came on with p0171. My live data showed under acceleration my short term bank 1 full trims were all but matching bank2. Did the smoke test and found a small vacuum line leaking. Fixed that and still no change in idle or fuel trim. I did a compression test. See picture for results. Something else I found is I have an aftermarket intake manifold on it. No markings of a manufacturer but it not an original. Also, the car has an aftermarket cold air intake. I wish I had an original air intake to make sure that’s not causing a problem.

So my car does not have a Schrader valve on the fuel rail. My scanner only allowed me to read fuel pressure (relative to manifold vacuum) kPa. After converting the numbers, I ranged 38-40 psi per my scanner. Also, I found my problem... Please see photo. After removing the extra seals, lol, my lean condition is done!