Thanks for your reply. I thought it might be a vacuum problem, but I
couldn't find any vacuum lines obviously blown off. Any idea where I
can find schematics for the vacuum lines, so I know where to start?
I'll have to get someone to keep the truck running, so I can try to
listen for a leak. Is it most likely going to be right around the
carburetor?

If that doesn't work, is the next task to start dismantling the
carburetor to look for a problem?

Thanks,
Jason

Kevin wrote:

> Most likely the induction backfire blew off a vacuum line somewhere and you
> now have a vacuum leak. It may have even blown back through the carb and
> dislodged some crud or messed up a seal in the carb. It might have even
> blown an intake gasket, but the point is that it really wasn't the SeaFoam
> that did the damage, it was the backfire. There is a pretty good chance that
> the problem is minor, although it may be hard to find the vacuum leak caused
> by the backfire, but that is what I would be looking for if it was my truck.
> --
> Kevin Mouton
> Automotive Technology Instructor
> "If women don't find you handsome, they should at least find you handy"
> Red Green