Type your answer here... I had the same problem with my 96 Tahoe.. Vortec 350.
Problem was a blown intake gasket.
Vacuum leak, clogged/dirty fuel injector, bad spark plug/ wires.
There are several things that can cause your 2003 or Expedition to misfire. The most common cause is a plugged catalytic converter.
Yes.
It could.
you would use a Graduated Cylynder
A defective aspirator valve would unlikely cause a misfire monitor failure. It would more likely cause an air system monitor failure
I am having the same problem with my 96 Tahoe. I was told it was my crankshaft position sensor, so Ireplaced it.That was not the problem. At this point I don't know what it is. If you find out, could you please email me at scott-poynter@sbcglobal.net Thanks Scott
If you have a "check engine" light on, start with having the codes read. A misfire code can tell you which cylinder or cylinders are having problems. A misfire could be the cause of your engine vibration.
The trans mission IS probably going out. This is a well know defect in the 2002 Tahoe. Google it.
driving it to roughly
bad or failing alternator
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.