Hai friends bought a 2007 mehran vx 2 months ago car has some issues..........first when car is cold in morning it start missing 1km or 1.5 after its ok.....thermostate value installed by me and fan is auto using zic coolant..........in day time its again do same missing and lot of vibration in car .......i have changed the foundation of engine still vibration does this problem is normal in mehran or else i am new to suzuki mehran :D;)......2nd car engine was in good shape no smoke .......not eating oil........oil grade i am using havoline cng 20w 50 api sj........average is very low 12km without ac in city. although i am a light footer ......tunning is done oil filter is changed ......what can be the issue.....on more car belt make sound i have lubricated it many times but on next it again make sound when car is cold