I get two ECM Codes P0035 and P1027. The car idles rough and stalls when you start it.

Yes, the code is fuel trim related, ECM is dumping fuel.

The PCM may log the P0170 code for the following reasons: Contaminated Engine Oil (too long since the last oil change) A leaking injector.
Aug 11, 2021

P0170 Code: Fuel Trim (Bank 1) - CarParts.com

https://www.carparts.com > blog > p0170-code-fuel-trim-...

P0170 Kia: Code Meaning, Causes, Symptoms, & Tech Notes

https://www.engine-codes.com > p0170_kia
A dirty air filter, air filter housing, Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes of the P0170 code. 'What is the Cost to Diagnose the ...

Did you change the ECM to match the newer engine?

https://www.google.com/search?q=1992+GMC+Sierra+ST%2C+5.7+TBI+runs+rough

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code p0190 refers to fuel rail pressure (FRP) sensor--circuit malfunction===causes wiring--FRP sensor--ECM
code p0455 refers to evaporative emission (EVAP) canister purge valve --open circuit ===causes wiring short circuit--EVAP canister purge valve--ECM
code p1131 refers to faulty heated oxygen sensor (HO2S) bank 1 which is the sensor in the exhaust manifold before the cat converter

OBD-II code P1603 indicates an issue with TCU communication.
There are communications that exist between the engine control module, or ECM, and the transaxle control module, or TCM. This communication is done through a control area network, or CAN. With the communication of the CAN, an independent pin and wiring is needed to receive a signal that includes sensor information from the ECM. The more information there is to communicate, the more wiring that is needed. When it comes to CAN communication, all of the information communicated is done alone control modules like the ECM and TCM using CAN lines. When there is a problem with these lines, the ECM will detect the problem and store a P1603 trouble code; the storing of the trouble code is what causes the SES or check engine light to illuminate on the dash.
Possible causes of trouble code P1603 include:

• Faulty transaxle control module (TCM)
• Faulty engine control module (ECM)
• Harness running from the TCM to the ECM has a short
• There is a poor electrical connection between the TCM and ECM

Diagnosing the exact cause of the problem should always begin with a visual inspection that could reveal bad wiring, loose connections, or damaged parts. From there, it is a matter of running down the list to determine what needs to be replaced. In general, a bad ECM will cause a loss of power, poor fuel economy, and stalling engine. While a bad TCM will have more prevalent transaxle issues like erratic shifting
P1605 and P1605
These codes are indicating a starting problem and rough idling. Code p1604 is a very vague code and diagnosing it without having a symptom is very complicated. And code p1605 is rough idling which means that the computer have noticed a rough idle situation usually this code is accompanied by other codes or if it's alone then I would suspect a fuel pressure issue. These two codes involve diagnosis and we'll need to dig into this problem deeper to find out what's causing them, Unless you are an experienced technician who need assistance then I will suggest that you take your vehicle to your local toyota dealership and they should be able to find the problem.
P1P

Yes,spark plugs,wire,coils,fuel filter,TPS rough idle,You lackey have all.My car run kind of fanny no light hard to say what wrong.

first of all a flashing check engine light indicates STOP as soon as possible SAFELY.. as for if you continue to drive damage to catalytic converter may occur. Have you had codes pulled yet ? start there the codes wont tell you wrong exactly but will give you problem area to start checking out. check for data link connection. make sure it can communicate with scan tool. commonly on fords is the ecm fuse is in same power supply line as cigarette lighter.( you figure Huh.) if fuse is blown it affects ecm power supply and causes drivability issues. and fuse is labled cigarette lighter fuse and Not ECM power supply. hope this helps if not pull codes and repost more info i get the more i can help . good luck

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_9ddabbbc483e2add

it will have codes but the scanner in use doesn't have the right protocol for reading them
Indicates a faulty ambient air temp or BARO sensor so there will be codes

sorry but their are no diadnostic codes with this number in the manufacturers codes i have
P0505....Idle Control System
P0507....Idle Control System RPM Higher Than Expected
but i have found these generic codes for you if they help

sounds like a vacuum leak still, check egr and also could be possible intake leak.
Spray bottle with water is best, and will run even more rough or stall when you found the leak.

We would need to konw the codes to be able to answer that .