I FIGURED THIS OUT WHEN I BOUGHT THE CAR AND IT WOULDN'T REV PAST 3500 BUT THEN I CHANGED THE DIZZY AND IT LET ME REV OVER 3500 THEN IT STILL STUTTERED BUT ONLY WHEN FULLY WARM AND NOW IT STUTTERS EVEN IF IT IS NOT FULLY WARM TOO. I ALSO CHANGED THE THE COOLANT SENSOR,OIL, SPARK PLUGS, CAP, ROTOR, FUEL FILTER, COOLANT DRAIN TOO. I THINK THE IAC VALVE JUST NEEDS TO BE CLEANED BUT I DONT KNOW I NEED TO FIGURE THIS OUT IT IS STARTING TO **** ME OFF AND IS MAKING MY FUEL ECONMY PRETTY BAD TO SO I REALLY NEED SOME HELP GUYS IT WOULD BE GREATLY APPERIACTED! THIER IS ALSO A CHECK ENGINE LIGHT FOR A CODE 41,6,4 AND I FIXED 2 OF THEM I THINK THE THIRD ONE IS THE OXYGEN SENSOR PLEASE LET ME KNOW WOULD BE APPRECIATED!

 

Please turn off the all caps. And some punctuation would make for easier reading.

How old are the plug wires?

Did you set the ignition timing to spec using a timing gun when you installed the new distributor?

So you now only have code 41? That means the O2 sensor is not working, which will kill fuel economy.