Good Day all. Had to replace an injector on my son's 2000 300M. Replaced the injector and set the plenum back down, hooked every thing back up and once it started it would idle at no less than 2000 rpm's. The plenum gasket is new and the the seals on the rear egr tubes are new but when I put my hand over the throttle body, there was almost no suction. I have lifted the plenim and took ma peek to see if the gasket moved and it was still in place. Any body have any idea's.