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Too easy to assume you mean ignition timing. Like Ken's reply guesses, your 91's ignition timing is not intended to be adjusted.
But, valve timing will give you the same result if one cog out of time. I bought a 91 similarly sluggish and found the belt was one tooth off.
The easiest way to check is by pulling the upper timing belt cover and rotating the crank using a 15/16" socket until the cam sprocket mark lines up with the reference. Then look at the timing mark on the crank pulley. If not lined up, you've got some more work to do regardless of the reason.
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Art Benstein near Baltimore
I'm not into working out. My philosophy: No pain; no pain.
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