The other day i was about to drive home from my friends house in my 96 jeep Cherokee and i had a code come up for my map sensor and it was running realy bad so i replace the map sensor and it ran good at first then i drove down the road and its acting up again and i also cleaned the IAC , replaced the spark plugs, wires, rotor button, and the distributor cap and the fuel filter. I also am not coming up with a code. Right now it starts great but get goin down the road and it revs up and down when you accelerate and when u are coming to a stop it idles low then when your stoped the rpms go back up