Am replying to the answer sent by KHLow2008, have already changed spark plugs, fuel filter, air filter while plug wires, rotor, Dist cap is fine according to my mechanic but one of the plugs showed little more worn-out than the rest. I also had valve stem seals and head-cover gasket replaced. Am not worried about smoke as could be one of the symptom of loss of engine power. Do U know haw much do I have to donate? Thanks for earlier reply while eagerly waiting for this.