I've just finished putting a new head on a 2.3L engine and have re-assembled the whole thing. I'm not getting any error codes, but something isn't right. The car won't idle at all. It runs and with some throttle work will continue to run, but won't drop down to idle. I've checked and rechecked the connections, and sprayed ether around the engine compartment while it is running to see if there is a vacuum leak. There doesn't seem to be one. Anybody have any ideas on where to start