Engine, backfiring and sputtering while using cruise control

[Deanc]

Engine backfire and sputtering while using cruise control replaced mass airflow sensor throttle positioning sensor O2 sensor cannot figure out why sputtering and backfired

 

[TIMINATOR]

Vacuum leak in the cruise diaphragm?
It changes position when it's holding the throttle open and doesn't have vacuum on it unless activated.
TIMINATOR

 

[Chuck Leeper]

cannot figure out why sputtering and backfired

Data recording is what's needed to avoid exactly what you are doing... Shotgunning parts at the problem.
Do you have a Scanmaster, or other diagnostic tools?
What else have you gone over?
Vac lines?
Wiring?

 

[TireFryer]

my favorite thing in the buick world. "I bought a grand national and it runs like crap whats wrong with it even though i know nothing about the car or its history."