Whats the best way to check for a lower intake gasket leak at the lifter valley side? Thanks
Check your PCV line for oil. Lower intake leak would tend to foul the plug in the area of the leak, oil from PCV will foul all plugs with the ones closest to the PCV intake vacuum line being the worst.I have a smoke tester, i'll try the way azmack suggested, thanks.
Would a leaking lower intake gasket on the valley side cause plugs to foul (black) as well?
What made you initially think that you had a vacuum leak?Went out and tested. Thankfully no leak @ the lower intake. I did find a leak at the tb to valve cover fitting (on TB side) I drilled/tapped the tb and ditched that press in 90* fitting that accufab uses. Finally got my idle to drop and idle @ the command in the Holley software
I also noticed a leak at the tps sensor where the throttle shaft is, but according to accufab this is normal.