TCS, Slip and sometimes ABS lights on

[bluemaruder001]

Hello all.
I have a 92 Q45 Base model with about 178,500 miles. Sometimes but not always I get the noise under the hood, at different speeds it will happen. Sometimes I will be driving for a half hour before it happens. I am pretty sure the noise is ABS pump. this is associated with TCS, Slip and ABS lights flickering. Sometimes the lights will stay on, sometimes they will not. Sometimes it is just TCS and Slip and sometimes it is all 3 lit up after noise. Both brake fluid and TCS fluids are full and clean. I have read some somewhat similar cases on here, just wondering if anyone has seen my exact problem and what it took to fix it.

Thanks,

[94Q45Beast]

check TCS control unit. above the left side of the fuel tank, I think you have to drive the car for a minute above 2000 rpm or something like that for the control unit to throw a proper code.