E99 question

[cmthomp2]

Got an e99 F350 automatic 4x4 srw. When going down the interstate on cruise control when going down a hill or if engine lets up the truck starts what i call bucking? If I step back on the gas it quits. And if Im pulling our horse trailer its worse. Any ideas? does not seem to do it if im not on cruise

[miked7.3]

i had the same thing happen to me at about 70 while in cruise control

[codysweat]

mine used to do it i changed my pcm and it helped the cruise control buck i switched from the xle4 to a pmt2 just make sure its auto and out of 02 or 01 not from california also a lot of the 7.3 had a cruise control recall i suggest u check in at the ford house i kno its free i put em on all the time. if its a very serious buck/shake might b trans issues

[revolvingsteel]

Yep, mine too! Only occasionally. If its the PCM I hope tuning cures it!