well i did put the tape where waqas just mentioned, but just wanted to reconfirm, because that did not make much difference.
my car was very good till day before yesterday, and then cng kit leak hogayee (the part of kit in the engine), and the mechanic opened it to adjust something inside, and after that the problem has started. cng par pick is very low in low gears, although at high speeds it gives good speed.
so yes, you are concluding right, we need to get the gas settings checked by a good mechanic.