1990 Bus

I recently started a The Volkswagen Repair Blog as part of the 30 Day
Challenge. The blog is showing up on the first page of Google when
searching for Volkswagen Repair. Based on my research there are people
who are looking for answers and most likely not getting them. In fact,
a couple of people have left comments who sound like they need help.
What do you make of these comments:

1990 van 2wd
stopped in driveway after starting and starting to back up the
starting and running at this time was smooth
but i went ahead and replaced the cap roter wiers air filter coil no
help still cant get it to do any thing when its rurnning over i can at
different attemps smell the fuel comeing out the tail pipe and it has
a good spark to the eye this model doesnt have a timeing belt but it
does have a ignition modual or possable the problem could be in the
fuel injecters but this is unfermilar teritory to me plese advise

And the second:
I have a 2001 Volkswagen Jetta w/51,000 miles, I heard a rattling
noise under the hood and the check engine light is on, the car failed
the vehicle inspection for the following codes: PO171 System too Lean
(Bank1) & PO102 Mass or Volume Air Flow Circuit Low Input, the VW
Dealership said the Secondary Air hose is broken, the mass air flow
meter is faulty & the tech noted secondary air pump brackets are
broken and the repairs would cost $930. I am a little old lady, can
you shed some light on this. This seems like a manufacturing problem
more than one of wear & tear. Please help me. Thank you.

I'm sure these people would appreciate the collective support. Your
input is appreciated.

All the best!

Garth

P.S. Feel free to drop by and see the blog so far - it's been up about
4 days...
http://www.volkswagenrepair.net