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Because of it's age a tuner will be very difficult to find. For my 89 4.9 I had decided on a hypertech PTM module. The 94 may have a few more options, but not much.
For replacement PCMs, you will need the calibration code on the PCM to get the correct replacement.
It will be on a sticker on the top of the PCM connector. There will be a bar code and alot of other letters/numbers. Your looking for a 3 or 4 digit set. To see it you will probibly have to remove it.
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