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.