I have a 91 3.1 in my Firebird. After replacing a bad battery the idle got goofy! It was fine after I fired it back up and drove it about an hour. Then it started getting rough occaisionally dying at lights. It ran this way for a couple days gradually getting worse. Then one trip it died once or twice and then it smoothed out and never had anymore problems. It was fine for months. Over the weekend I had to disconnect the battery to do some work on it and the same problem returned. It finally settled in today and it's idling okay again. Why is this doing this? I have heard that the ECM can learn and adjust but I thought that happened fairly quick like in the first hour or so. I have also read on here about a procedure to setup the idle. Is it the same for the V-6?
Thanks,,, Matt

 

there is an idle re-learn procedure, on my beretta you have to start it cold let it run until the fan kicks on then shut it off, wait about 15 minutes, start it again until the fan kicks on again then turn it off, and it should be all set.

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86 Camaro with 88 305 LB9 using 86 carb setup, edelbrock performer manifold, 305 S/R Torquer Heads, Hedman Headers, Crane Compucam 2032 edelbrock cat-back, gutted cat, slp underdrive pulley, mallory ignition, 305 h.o dual snorkel air cleaner, hypertech thermomaster chip,160 degree thermostat, 5-speed, 3.23 posi

95 Beretta Z26, 3100 V6, 4 Speed auto, stock