Stock cam as far as I know (the the timing chain was old). Only mod is a TB coolant bypass and my idle was just as rough before I did that. TPS was around .6 volts I think. It has been a while, but I remember it was in spec. It did increase and decrease steadily. Is it possible to maybe have a valve guide leak bad enough to cause a bad idle like this? What can I do to test for this? I know I'm really fishing here but this is getting on my nerves.