Cruise control turns on/off automatically, causing engine to surge.

The BCM was removed and send to aftermarket repair, but tested OK. The PCM was replaced a few years ago from good internet source, and security key/lock replaced about a year ago with no problems since.

What to check next??

 

im told ,speed sensor, vacuum to cruise or computer under dash. I have the same problem. richielap

 

Have you had a problem with ABS, a simple malfunctioning ABS sensor can knock the cruise system on and off ?