Fuel Injection Computer -- 88 5KSQ

[b1biker at aol.com]

I replaced my fuel injection computer with a used unit from Chris at Force Five. Initially it corrected some of the issues I had been having but after running for less than an hour all of the problems returned. Chris sent me another unit as a warranty item but before I install it I'd like to determine that there isn't something that is causing the computer to fail.

Here's a list of the symptoms that I have identified.
   Idle speed stabilizer is not functioning
   When key is switched off engine does not immediately stop (it used to)
   No power to cold start valve
   Mileage calculator on dash display does not function

With the original computer the first problem that I noticed was the idle speed stabilizer followed by the cold start valve issue; the last problem to surface was the mileage computer. The first replacement computer did not solve the cold start problem but did fix all of the other issues; it basically failed all at once.

Any help/advice will be greatly appreciated.
Gary Meier
885KSQ -- 94 S4