Fawad bro how much Toyota Capital will charge me to do tuning of my car.And one thing more tomorrow i am going to change the PCV valve of my car too as recommended by my friend who is a Auto Diagnostic Professional in UK.Lets see what happens.
In your case you said that your rpm goes below 1000 but comes back to normal but in my case on
Cold start Rpm=1000-1200
Normal Temp with gauge in Mid Rpm=800-600
Full warmup gauge a little bit above normal temp Rpm=400-200 with stalling and rough idle and shut off while driving.