2003 ford taurus dohc, 3.0

getting a code p0302. cylinder #2 misfire. changed plugs,wires,pvc valve,fuel filter,air filter.112,000 miles. surges, check engine light
flashes, runs good after pvc valve replacement, then went all to ----. will check all vacuum lines tomorrow. please help with advice. e-mail, snipped-for-privacy@charter.net must save money for gas.
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