try this: change plugs and gap them according to factory specs, change fuel filter, run a full tank of 93 octane to help clear things out on top of a bottle of fuel injector cleaner. How does your fuel pump sound when you just turn the key forward w/ out starting it? It should make a slight hum when you turn the key forward and stop after 4-5 sec. If it makes a loud hum and takes longer than 4-5 sec. to pump in itial start up fuel, time for a new fuel pump as well. Cover the entire fuel system is your best bet.
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2001 Z/28
Cam, exhaust, gears = a lot faster than your mustang.
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