Codes P0016, P0113, P0123, P2135, Vibration, rev high, tapping sound from the right bank?

On Saturday 16/7/2022 about 5:00pm a client called me to his abode. When I got there he told me that he observed when he was about to drive into his compound that oil was leaking in his car. Although, it took me some minutes to troubleshoot the problem because the oil spattered excessively to many of the accessories of the car like alternator, power steering pump, fan belt, TPS, A/C compressor, etc. I searched for the leak and finally saw what was causing it. I noticed that it was because of the CKP oil seal at the pulley side/front of engine. It was late hence auto parts store closed that was why I didn't replace the seal that day but encouraged them not to drive the car until I replaced the seal.
On Monday 18/7/2022 I changed the seal and the leaking stopped and the idled fine, but I only observed that few minutes to avoid catastrophic outcome to the engine because the engine oil level was low. After the replacement of the seal the fan belt cutoff, and I replaced it as well.
They didn't drive the car until Tuesday when they went to the replace the oil. But before they moved, they called and said that the whole car was vibrating. I was unable to reach out to them so I told them I will meet them on Wednesday 20/7/2022. I got there yesterday as promised and noticed a severe vibration at idle which wasn't there when I left on Monday.
I scanned the car and retrieved some codes that I will upload. Among those codes, I was particularly focused on the P0016, P0113, P0123, and P2135 although I verified the ignition codes and saw that it fired very fine.
As a result, I cleaned the CMP sensor of the 2 banks and installed them back but to no prevail, I still noticed a vibration. I pulled the CMP sensor again within 2 minutes of idling and noticed that it was dirty again. This time I had to pull VVTI solenoid valve of both banks alongside the CMP sensor and cleaned them. In addition, I used a very clean dry cloth and insert into the CMP sensor hole to properly clean the inside of the engine. In the process, I also noticed that the injection head where the TPS sensor is tightened was very dirty as when a carbon and oil are mixed together so I cleaned that too using a tooth brush.
Finally, when I put everything back to it's respective places the idle was very nice because the car didn't vibrate again!
However, there is a problem that I want you to help me out with. It's a high rev in RPM to about 1.4 at idle. I Before I left there yesterday I scanned the car again and found only the P0123 and P2135. Please note that this two codes appeared only after cleaning the CMP sensor, VVT solenoid valve and the injection head. It didn't appear before the cleaning of those accessories.
When I started the car, it revved high from about 1.25 to 1.4 RPM and remained there. The RPM doesn't go up and down. When I accelerated the car, it rev very fine. I also noticed that the TPS connector was slightly broken, it didn't fit in very well and didn't hear a snap sound when connected to the TPS module. But whenever I pulled the TPS connector completely out when the car was idling there was a great reduction in RPM as if the car wants to stall so I immediately connect it back slightly and noticed that the RPM goes down and remains at 1,000 RPMs. The car owner even noticed the reduction in RPM, stood up and moved to me and said that that's the way the car should idle. But if is still connected at that place and switch off the car it idles to 1.4 RPM and remains there until I repeat the unplugging of the TPS connector process.
I tested the connector with my test light and noticed 2 ground out of the 6pins (one of the ground was very dim the other was bright) at the pin connector that illuminated the dim light when tester was at battery positive. I also noticed a dim light when I checked for current with my test light now hooked up to ground and ignition switch activated to "on" position.

Please help me, how do I permanently solve this car problem?