Help me if you can. My 86 GL automatic has a bouncing idle problem.
It's about a half second cycle and 100-200 RPM swing. 900-1100 RPM.
It started after I replaced the O2 sensor and Temp2 sensor and some
vacuum lines.
It happens when hot (after that cold hesitation)and sometimes it goes
away. I do have a questionable connection at the Hall sender that I'm
going to investigate.
The PO said his mechanic(also a PO) advised a new/used ECU. I'm ready
to swap my 89 ECU to see if this helps.
Any brainstorms are welcome.

Roger Van Till
'89 Westy "The Moose Lounge"
'86 GL "Sugaree"
'81 L "CoJack"