when i cruise around and hit the gas, i heard weird noise, sound like chain cracking. is it my timming chain goin south? how hard to change the timming chain and etc on it. how much $$ on parts? i'm jobless rigtht now and will try to do it myself(i only got limited of experience. i fix my jeep cherokee but i dont dare to touch the maxima)

the next thing's my lighter plug got no juice/power. i check the fuse and it look good. what else go wrong?

how much does it cost to tune-up on the max? it dont have any model on it, se or etc. spec;95 w/ 146k, at, power windows and doors. i check on autozone and the guy told me the plug wire(??) cost around 65$ each(65x6cyl=390$)!!!is he bull****tin???

thanks