My GMC yukon runs rough at low RPM such as when I come to a stop. Engine RPM drops to around 400-500. Engine shakes as if miss firing or about to die. No check engine light appearing.I had check engine light in past. Cant remember codes but they said (engine lean Bank 1& 2). I changed mass air sensor and put engine treatment in fuel tank a couple of months ago. No problems until yesterday. I was told in past it could be a bad intake gasket also. I have appointment at dealer Monday. Do you have any suggestions? Please HELP.
have the same problem?
Saturday, January 31st, 2009 AT 6:26 PM
I would check the Throttle Position Sensor, crankshaft position sensor, camshaft position sensor and fuel filter as for the engine lean bank 1&2 that would be the 02 sensors
Saturday, January 31st, 2009 AT 6:55 PM
Oh and o2 sensors are new but I didn't replace the harnesses and cats are not plugged.
Monday, November 21st, 2022 AT 12:52 PM
This is common when the fuel pump goes out be to be sure let's do a fuel pressure test by following this guide: