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If its starting hard like that...95 % chance its a bad fuel pressure regulator. Pretty easy to change on the 3400's. Good way to check is to turn the key to on and then pull the vacuum line off your regulator. If you see fuel in the line or smells like gas, the regulator is bad. It's on the top of your engine on the fuel rail. Would change the fuel filter while you were at it. Work at a garage in MN and change a lot of fuel pumps due to clogged fuel filters.
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