Hi All,

I've got a problem with the old girl. It starts fine, but once it
idles down to its regular idle RPM, it starts to chug and is burning a
ton of gas. If I remove a vacuum line, the truck runs a lot better.
There's a little more to this story. I had a problem with the starter
engaging whenever I stepped on the brakes.  I later found out that
there were two wires shorted together and to ground on the exhaust
manifold (courtesy of the technician who installed my immobilizer). I
fixed this problem, but am wondering if I could've buggered up the PCM
by having these wires shorted and grounded. Anyway, once the vehicle
warms up and I'm doing highway speed, it runs fine. When it's idling
though, it will run extremely rich and very rough. The engine light is
also on constantly. I got the codes off of it and it brings up a "MAF
sensor lower than expected" alarm. I checked it out at the PCM and it
looks like this is true. I'm getting close to zero volts on the MAF no
matter what the engine RPMs are at. I'm just looking for some
suggestions and ideas before I spring for a new MAF sensor as they are
not cheap. Thanks.