thanks,
I did the connector cleaning but didn't find any improvement in the situation.
One more thing that I forgot to mention in my last messages is that while in neutral if I push and keep the accelerator to around 2300 rpm, the rpm starts dropping and rising, This started or I noticed after getting TB cleaning done from Suzuki workshop a year ago. Asked the guy and he said that this is related to ECU.
One other mechanic said the this is some sort of cutoff to avoid extra pedal in neutral. One had some other theory
Any ideas?