dont know what it is
it was some screw that i was moving
anyways went to khattak n even he was unable to do the setting because the issue was something else
it wasnt hot water pipes but the kit is full of oil from lpg usage, he opened that idle rpm spring n said see it is full of oil n even this spring has oil on it, u need to get your kit serviced, i told him to just open the drain nut n he said no no that wont help ur kit is full of oil, i insisted n he opened it n alot of oil came out, so this oil was the issue, he said there's so much oil n because of this it wasnt keeping the settings, btw i saw his hand, that idle scew is some where on top n i was looking at the bottom, n yea i saw it had spring as well, i asked him to show me where it is n he said u'll get its smell on ur hand which wont go :S khair next time i know where to look for atleast
i asked him to adjust T bolt n he said its already fine where it is even though i told him that i changed its position :o
today even he asked me to keep a constant race at fixed rpm when he was setting idle rpm
he's asking 1200rs for servicing the kit n said get it done ASAP n that cng setting may get bad again due to this
though even now on stopping rpm comes down to 0 n car trying its best to turn off but shukar hai it didnt the whole time even when i was stuck at that military check post on pesh road
@muhammadasimzahoor
ask sajjid cng how much he takes for servicing the kit, though i think draining oil should be enough, i just need the screw key to open the nut, but i wonder if i can place it back myself, btw to put it back if oil is needed to b drained, let it keep draining drop by drop by keeping it open all the time?
show his location on google maps 
khattak also said that those lpg guys seem to b filling oil more than the gas itself from the looks of it, so draining oil is a must wid lpg
he said u dont need hot water pipes for this issue, it has nothing to do wid that
i wont b going to him the next time, as he keeps asking for money for setting every time even if i'll go next day though he's the one to set it on previous day, says ab hum b mazdoori krne k liye bethey hain