2007 Tahoe z71 Stabilitrak Problems

i went fora oil pan gasket change soon after i got TCS lights/stabilitrak lights on with the car stalling gages going crazy i took it right back in, and the mechanics could not find out what the problem is..i thing there is a defect in the computer chip cause i have had all sort of crazy things with this tahoe happening,car seat going back and forth out of no where,the kids tv monitor working as it pleases, engine light turns on my car lights dims,rare trunk won't work..EVERY THING has been checked nothing is wrong with battery either...WTH...i can't know what it could be so i can pay and have it fixed..any one with any solution please contact my email...[Email removed]

thank u