when i start it it makes the "checheche" noise then it after it warms up everything goes away and it vibrates a little. all the belts are new and spark plugs but the timing belt hasnt been changed and its a bit weaker now, it has 94,000 its a 2002 3.5 do you think the timing belt needs a change? it runs great its just that noise i cant figure out what it is all the belts are new and tuned up recently with NGK plugs im guessing its the timing belt. please help me...