In 2008, the Reiz engine could not speed up. Please help me tell me what the problem is.

I recently bought a 2008 Reiz 2.5S, and it feels good to push my back. Recently, the power of the car has dropped significantly. It can hardly be compared with the first time I picked up the car. When you step on the accelerator, the speed increases, but you can't lift it and the sound is dull. It's the same whether you drive in sports gear or change manual mode. It's boring to drive. At first, I thought it was an ideological problem, but yesterday, I found a friend driving a Reiz and driving around in my car. He also said that there was something wrong with my car, and he couldn't tell the exact reason. I went to the overhaul factory and checked it with a computer. There was no fault code. Basically normal, there is nothing wrong with the spark plug. Have you ever been in such a situation? And please help me diagnose what is the reason and the solution? I really appreciate it. Recently, I bought a 2008 Reiz (check the transaction price | model details) 2.5S, and it feels good. Recently, the power of the car has dropped significantly. It can hardly be compared with the first time I picked up the car. When you step on the accelerator, the speed increases, but you can't lift it and the sound is dull. It's the same whether you drive in sports gear or change manual mode. It's boring to drive. At first, I thought it was an ideological problem, but yesterday, I found a friend driving a Reiz and driving around in my car. He also said that there was something wrong with my car, and he couldn't tell the exact reason. I went to the overhaul factory and checked it with a computer. There was no fault code. Basically normal, there is nothing wrong with the spark plug. Have you ever been in such a situation? And please help me diagnose what is the reason and the solution? I really appreciate it. Mine has the same problem with Reiz in 2008. 4S technicians are still relatives. I changed the steam filter, spark plug and infusion bottle, but I still feel nothing. It's just that the power will be a little better when it's cold. My back-pushing feeling has disappeared, and the idle speed is a little unstable. My grandmother Rui in 2008 had the same problem as you. I recently started with Reiz in 2008, and I am very motivated to drive home for a few days. As a result, I bought 0-20 engine oil and changed it on Sunkist. I found that the idle speed increased, the noise increased, and the speed increase was as weak as yours. As a result, I switched back to synthetic engine oil at 5-30 yesterday, but the situation still didn't improve. The noise of refueling was very loud, and I was still weak. . . I don't know where you found the problem. You didn't change the gasoline filter. I removed the connection between the middle and the tail, and there was nothing there, but the car was just boring. When I hung the bottle, I found that the right exhaust pipe did not smoke. The big foot oil of the car is stuffy, it will explode when it is fully loaded and overloaded, and sometimes it smells of burning. The technician cut the tee, and it was true that the glass fiber inside blocked the right side of the tee. I forgot whether it was opened or cut at the back of the middle section, and took out a lot of glass fibers. The test drive was great. The viscosity of engine oil is too high. Change the viscosity to 0w20, and it is estimated that your push back feeling is back. ,,, It's blocked. You can see that the middle part is blocked. The rear part of the middle section of the exhaust pipe is blocked. Common diseases. To cut the tee, take out the glass fiber inside. Oil, exhaust, check exhaust blockage, or air flowmeter? @20 19