Hi all.am having some trouble with my Rav 4.I had a cng installed in my SUV,but after having trouble with it,i removed it after a while.Now the problem is that whenever my jeep is in low gear,it knocks a lot,even though i have installed iridium plugs in it n replaced the fuel filter.I would like to know if ne1 of u know ne good mechanic with computerised tune up facility in islamabad