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if'n you check through the forum using search, you'll find this one has been answered many times... and that answer is
The ECU doesn't get a chance to "close down and record last known good setting for the engine, and can create running issues. Computers tend to not like having the power pulled, they would prefer to shut down gracefully... using the kill switch cuts power to the computer, thereby crashing it.... when it powers up again, it likely checks for proper shutdown from the last run cycle. When it finds that the last cycle didn't end the way it should it *may* do something...
Resetting the ECU ... ???
I know that if you disconnect the battery, you'll get a check engine light for three consecutive run/hot/cool cycles....
To recalibrate the ECU, one should take a nice long ride to get everything up to temp and upon returning home, do not shut it off, but let it idle for 10-15 minutes whiteout touching the throttle or anything else, by this time the cooling fan should be running all the time or most of the time ( unless it is cool outside), doing this will allow the ECU to recalibrate to the best settings for the current condition. I'd guess that anytime you have a drastic change in altitude or climate this would be a recommended procedure to get the best performance form the engine.
(Older Saabs had a similar ECU recal routine where by you started at the bottom of a long hill and at about 35 in 4th gear, then floor it up the hill, pegging the throttle and turbo gauge until you get over 5500 rpms. ( at which point one is going 90 or so)
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