1993 Other Jeep Models Jeep 5.2 high idle

I have a 93 JEEP GRAND CHEROKEE, I replaced all of the vacuum lines with all new rubber hoses and fittings, the idle got better, it was at almost 2 rpm, I have it down to a little above 1 rpm, but its suppose to rest at like.7 to.9 rpm I think, and im racking my brains out trying to figure out what the hell the problem is, I replaced the fuel filter, all new gaskets around the engine, nothing leaks. Recent tune up, I mean it runs pretty good for 180,000 miles, but can a bad egr valve have something to do with the idle, or a idle control valve, I dont know, im stuck, if you could point me int he right direction as to how I can get my idle down to where it should be, it would be greatly appeciated, thanks.