I recently purchased a '92 Eldo w/48K miles...I love it,however sometimes I'll be driving along and all of a sudden all the dash indicators will have dashes --- & the ventilation system blows on high thru the defrost... the car is still running fine...this condition may last 5--15 minutes then go back to normal..... I have done the onboard diagnostics--the I032,IO34 & I037 come up as current...NO SIR DATA, NO ECM DATA, NO PCM DATA..... Can anyone help??? [:@]

 

I'd start hunting for ground issues then move on to contact points and connections. Sounds like corrosion issues.