Make sure your choke plate is opening all the way and that the choke linkage is not sloppy enough to allow it to close.

Make sure you have the correct spark plugs, yours may be too cold for your driving, but cold plugs don't normally cause fouling that fast.

To foul in that short a distance has to be caused by an excessively rich mixture.


'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton