I beg to differ Maxwedge......I have 3.1 Olds and Cav, 2.8 Olds....and anytime the battery is unhooked the computer needs to get its memory back. Procedure.....turn all accerories off.....start engine and place trans in drive..or neutral for manual trans...run at idle till the cooling fan turns on, or for max of 10 minutes.Turn ignition off for at least 5 seconds.....and repeat. Let engine idle at least 5 minutes at normal temp in closed loop. Try it !!!!!!!!!