I am experiencing strange idle and looking to reduce possible problems.
LS6 with mid to large cam. I installed a LS2 throttle body on the FAST 92mm intake. I have a 2004 valley cover with the port that I connect my PVC value to then it connects to the FAST intake after the throttle body.
I have the stock valve covers which have an air vent on each. Should I plug the valve cover vents or leave open to the air. I would imagine that they should be closed and just allow the PVC vent the engine. Any opinions.
BTW, no air pump, emission stuff, no cats, no mufflers.
I am seeing high MAP readings at idle (50 to 75 KPa). I believe the pressure should be 30 to 50. I replace the MAP sensor and got same results.