[ffr 1137]

Fred. What are you running for an ECM? Is it a stock A9L? 850 sounds fairly close
to stock for that box. Unless you have a programmable ECM, you won't be able to
change idle speed. The ECM will return to it's default memory. I've got a mass-flow
with a speedbrain ECM (obsolete). I have had some erratic idle once in a while. I use
MAF sensor spray and wipe the throttle bores and butterflies with carb cleaner, making
sure the transition slots are clean. They do collect crud periodically. If they crud up
enough the car will start and run a couple secs then die...a real head scratcher the first time that happened!

Mike

Mike