1998 Dodge Neon rough idle, engine codes

1998 DODGE NEON
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REDTEG90
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1998 Dodge Neon 4 cyl Front Wheel Drive

car runs really rough at idle, even stalls a lot when its hot out. smoothes out when driving. had codes read and got cylinder 4 misfire {just replaced plus and wires, checked that number 4 is firing} downstream o2 sensor, cam position sensor, egr flow. is it likely one problem causing other codes. if so where should i start
Jun 13, 2010 at 11:30 AM
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RASMATAZ
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P0304

Check cylinder no.4 compression and injector
Jun 13, 2010 at 4:50 PM