Chevrolet Repair: Astro Van, astro van, fuel mileage

Question
My 1994 Astro 4.3 Z model(not vortec) is displaying multiple symptoms. AC working intermittently, same with wipers. Radio returning to AM station when van is turned off, also resets clock to 12:00. Speedometer is fully maxed out intermittently. Gauges go haywire sometimes. Headlamps go dim at times. Car seems to have a lot less power at times also. What's up with all this? Help!
PS... I changed out the pcm last summer and the resulting fuel mileage has been horrendous since then. Could this be reated?
Thanks.........Bart  8/15/05

Answer
Hi Bart,
I wonder if you need the PCM recalibrated.
Now for the intermittents...They may or may not be related, but what you describe sounds like a bad ground.
Make sure there is a good ground from the engine to the firewall. Also from the engine to the frame.
Clean the battery terminals real well. And check for loose connections at the starter, and all the connectors.

Van