I am having a weird issue with the service engine soon light coming on and off. I will work normally the first thing, then when I put it into drive in comes on and will stay on until either I depress the accellorater then it will go off for a short time. I had a code 13 which is supposed to be the engine shut off solenoid. I cleared the codes and started it up and now I get a code 33 which is supposeds to be the EGR control pressure/Baro sensor circut high. How can I fix this and where is it located. I am thinking that it is one of the sensors that on in the group on the driverside of the intake.