Alright BalenoMaster, today i went to a cng mechanic and he tuned the cng for me to run with the intake but disaster. The power is fully lost in low revs, the engine even stops sometimes. All he did was loosening that screw on the sensor until the engine was running smooth, but i think it was running smooth.
Sorry to say but i myself also messed with that screw tonight and adjusted it so it is nw kind of stable wen idle.
But i noticed that when the revs are low, and d A/C is off, a lot of, exhaust air is coming out of the muffler and its like Blup, BluP,Blup, BluP,Blup, BluP,Blup, BluP,Blup, BluP,Blup, BluP,. And at the end, this was the problem and i also got a check engine light.
I have made a vid to show you everythin, i m uploading it on utube, will send u d link in sometime.
Thanx in advance.
Here is d vid on utube