The A9L is the hot "known" computer. The A9P is supposedly more aggressive with fuel and timing curves. It is built for the automatics which aren't trying to spare the T-5.
The A9L is proven, and the A9P not so much. Running either computer should not cause problems.
As far as keeping your engine idle up to avoid stalling, putting your car in neutral for an auto and doing a quick stop will kill your car then? Not that I've noticed. My 87GT has no problems with dropping to idle speed 800rpms with the clutch depressed and not stalling. I don't know though, I am SD while those computers are all for MAF cars.
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