map sensor on 2003 GMC Envoy

map sensor keep going off/on replace the sensor and catalytic converter still occurs

Asked by for the 2003 GMC Envoy
you need to find the real issue. map sensors do not go on and off. there could be a control problem.
why did you replace the cat??

i replace the catalytic becacaue the map sensor is suppose to be the air flow through the manifold, and i had got a catalytic below threshold code reading before . will throttle body or the oxygen sensor cause the map sensor code to pop off/on .
no. the code was probably a 420 which is a cat code. the cat is longer working and must be replaced. the map sensor has little or no effect on your cat operation.

manifold absolute pres./barometric pres. circ code p0105
try this site. i hope it works which will show you what has to be checked for the failure.