I ran a obdii scan on my 98 ford windstar 3.0 on 1998 Ford Windstar

We'll it came back with the EGR, o2, CAT, HTR, EVR bubbles flashing. But also it read 4 codes system to lean bank 1&2 which I assume has to do with emissions. The other two codes were intake manifold runner stuck open bank 1&2 what is this IMRF does it have to do with the emissions as we'll? Also what is the HTR bubble Stand for? Can someone give me a hand on this?

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1 answer
Just the codes will do! Someone may give it a shot.