Hey everybody! I've got a question about my 2002 Gmc Sonoma. I've recently replaced the Vortec 4.3 motor in it doing all kinds of new gaskets, seals, plugs wires, everything. The truck runs great except when the outside temp gets around 30 degrees Fahrenheit it idles rough and the truck shakes like when your shivering from the cold haha, It goes away once its warmed up to operating temp but it never does it when its above 30. Any help would be appreciated!
@ryland
I just started to have the same problem with my 2008 GMC Sierra.
could be a bad injector and small chances of bad spark plug, do you know maybe in how condition they are? what happens when you pres gas pedal just a little, does engine than stop shivering or still doing that to some point?
@m3chanika
I just replaced all 6 plugs with laser iridium plugs so i don't think that could be it, i had the intake off and the injector didn't look broken but maybe they are, If i press on the gas while driving it'll still surge/shiver's untill its warm and sometimes after as well