I need help I have a 99 Durango 5.9L SLT and I cannot figure out what is causing it to bog down, spit, sputter, stutter, and jerk at highway speeds. When this starts I have to punch the accelerator to get it to pick up but once I level off it does it again. Done a tune up, looked for and did not find an EGR valve & MAF Sensor. I hooked it up to a computer and the codes it threw were Air/Idle Control and Sensor 1 bank 1. I also corrected my clogged catalytic converter problem. Now I am wondering if my MAP sensor could be the culprit. PLEASE HELP
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Does it do anything else when it starts stumbling? Is the issue random or consistent under certain circumstances?

 

have you had the plenum done ?

 

Tune up? Did you change the cap rotor and wires.