Hi I've got a 95mdl with a slightly rough idle, i changed the spark plugs and this made no difference, the motor sounds like it's got a slight rattle but it's not the lifters or bottom end or anything like that, I'm guessing it could be one of the belt pulleys or maybe the the timing chain, has anyone had a problem like this ?

I did hook it up to the diagnostic system (obd11 scanner ? ) it went through all sensors and found nothing wrong, any info would be great