80...I also have a 97 Vram with OBDII in my 82...I wired in a DTC and have the Autoenginuity Scantool software to diagnose MIL's....(check engine light).......I also had probs with the Cyntex chip...it was either ballz to the wall or stalled....hehhehheh...

My rough idle prob was solved when I put in a Steve Weiner (Rennsport Systems) box.....

The problem I went through above was the result of a fault in my 88 pin connector to #2 fuel injector.....

Adrian Streather's book is a must for DIY guys like us ...it is the 'Bently' manual for 993's....get it.....