(SOLVED) Dead cylinder at idle? Low temp on header collector

rumblefish360 said
The plate will separate the half’s on the intake. It’s impossible for the exhaust gas to travel to under the intake. The EGR valve has a vacuum operated valve that is open under idle to mid-ish throttle. It will close under a heavy throttle, approximately 3/4 of the way down. I don’t remember the exact reading I took on my EGR valve, but it was something like 9-11 inches.

When the WGR valve is open, it allows the exhaust gas to travel from one side of the intake to the other side. The plate blocks it off, period. Unless there is a bad gasket under it. Even then, it’s a very low amount.

I could be wrong but if I remember correctly the EGR should be closed at idle. I remember when I worked at the dealership diagnosing vehicles with a rough idle by using a screwdriver on the stem to pry open the egr valve and then letting it snap shut. Sometimes this would unstick a stuck valve or break up carbon in the seat of the valve causing it to seal back up.
If the plate is only sealed around the perimeter it could leak across the dividing wall. It doesn't take much for a vacuum leak especially if there is pressure on the exhaust side.