Trstrugar
OBS Enthusiast
My truck is a 1994 GMC k1500 with a 5.7l. I am throwing a code 33 for a map sensor. The truck has rough start up for about 10 seconds and then it seems to run fine. When I unplug the sensor it starts up fine, but runs extraordinarily rich. I replaced the sensor and it didn't make a difference so I don't think it's the sensor itself. TYIA