Cadillac Repair: 1988 Cimmaron V6 Idle Issue, grocery getter, dashboard lights

Question
Car died today on my daughter as she was driving low speed downtown, and when I tried to restart it would not maintain idle. She did say her dashboard lights went out, but assume it was just due to the engine stalling.  When I try a restart, it fires up with my foot slightly into the throttle.  You can easily feather the throttle to keep it running and was I able to drive it home as long as I did not drop to idle RPM's (no problems at speed), and am thinking I would replace the idle control valve and/or throttle body positioning valve in hopes of a simple fix.  If it is the main control unit I may go into pasture mode as these early years were not the greatest with OBD I electrics.  I want to give some additional background below, but thought I would start with the problem first.

Car has less than 50,000mi so overall excellent condition and has ran fairly well, no oil burn or leaks, injectors serviced recently and I run chevron through it for the Techrolene.  Though a somewhat lumpy idle, it is a perfect local car for my daughter to drive a round town.  During the summer the car would die from time to time with the a/c switched and coming up on at a stop sign.  The idle would increase when we switched on the a/c, but just seemed to not regulate itself well with the added load.  This condition seemed to go away as we drove the car more regularily since it had been a garage queen for the past 10 years and only had 2k miles put on it as a grocery getter.  Other than that the car ran well and recently passed smog (my Mom's car and she has stopped driving for years).

Thanks for any help.

Dennis

Answer
Please e-mail: onlineautohelp@msn.com in order to obtain the information necessary to fix your vehicle.

If you are mechanicaly inclined or know of someone who is, You will need a DIGITAL VOLT/OHM METER, Simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com