I have a 1994 Jeep Wrangler with 2.4 4 cylinder engine. I was driving from Washington state to Arizona and during my drive I was having a loss of engine power. At some points i could not get over 50 mph. I changed the PCV and O2 sensor along the way and it was no help. Any ideas of what might be causing this. I need to get this Jeep to North Carolina.