well i have a 89 s13 single cam and the other day i set the timing at 15 degrees and for some odd reason it started acting funny so i decied to check the timing and then now it doesnt even wanna go into timing i did all the necessary steps.. i took off the distributor and made sure everything was done and nuttin like i have no idea what to do... also my timing chain rattles and its been getting worse so i dunnoo i need some input guys on what to do.,...