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Re: P0300 Code
Vacuum leaks may appear on any engine, but can be especially troublesome when the engine has been replaced. Most of the time, when removing existing vacuum fittings & hose from the old engine, they will crack & split and if reinstalling them without a new replacement, leaks are more common. Check each and every line & fitting on the engine and EVAP system, one at a time. Each fitting must be tight & free from splits & cracks. This procedure is very inexpensive, especially if the problem is only a hose or fitting.
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