Computer problem
1996 Chevy Blazer 6 cyl Two Wheel Drive Automatic 114000 miles

hello when the blazer sits over nite when you start it the motor runs rough and dies when you get it to run the anti brake light and the brake light comes on and the engine has lost of power then lights will go off and service engine light comes on the codes are po122, p1122 which are egr vavle and trot sens these have been replaced by GM now they say the ecm is bad thats $600.00 from GM can you help me please thanks Sue

P0122= Throttle/pedal position/sensor circuit A low voltage.
P1122=Throttle posistion sensor out of range, or, Ignition control module 4X circuit.
You need to test both the sensors, and the 5 volt reference wire to them, We sell a sensor tester, but some knowledge is needed to use any electrical test equipment. Click on the top link in my sig file.