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Ok I just bought a 99 dodge 3500 24v Cummins with 222,000 miles I have searched but cant find nothing with same symptoms like mine exact.  When you barely touch pedal it revs really high when in park.  When you try to drive it it takes off really good then dead pedal then picks back up after it falls to around 12-1500 rpms and goes again it will not stay at a constant speed.   Try and it cuts out till rpms fall them picks back up again.  It appears the pump is not the original, and the guy I bought it from had it at a shop trying to get it fixed and they said they tried a different apps. But I dont think they know much about these trucks.  Any ideas?  Also I have a problem with IOD fuse it blows the instant fuse touches but when I first test drove it the radio and stuff worked fine no problem but he did say it had IOD problem.   

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Don't forget to check the AC noise issue, or you could kill another ECM!