Just installed a new motor in my jeep and it ran great for a couple days then all of a sudden it's running rough. When I first start my jeep it will idle fine for two minutes then it starts surging and idling rough then a few minutes later it smooths back out. Then it runs fine til I pull onto the roadway as soon as I give it throttle it bogs and hesitates then smooths out and runs perfect until I let it sit and run it again. Also when I get above normal altitude it stalls out and will not start again until I drift down the mountain to lower elevations it starts back up with on key turn. I have replaced the intake temp control and the tps as well as clean the idle air control. Please help it's driving me crazy!