1998 jeep cherokee running problems?

on startup it runs good for about a minute. i'll be going down the road with the rpms at a steady 1500 - 2000 and all of a sudden without me moving my foot off the gas, it loses power. even if i step on it more i lose rpm. i'll slap it into nuetral and it will run great but when i put it into drive it bogs down more. to get it to go away i need to floor it and make it shift itself into 4000 rpm for 4+ seconds before it runs right. after that it doesnt matter how long i run it it runs great. i replaced the idle air control valve and got new plugs but it didnt change anything. it also idles rough after about a minute of idling.
 
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