our van has just started missing @ idlesometimes dieing out. changed the plugs on 2004 Nissan Quest

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then got a code to change the o2 sensor. still misses @ idle... pulled a code for maf sensor, changed that. still misses.. now a multi plug misfire... What other possible things can I change????took it to the dealer, After 100.00 bill for diag. they say it needs serp. belt cracked, valve covers seeping, and motor mounts broke... WHAT the hell does that have to do with the misfire at idle.... it runs great @ operating speeds. HELP....
(2) Answers
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Not much if any...I cannot tell you whats wrong. Suggest to get a recommendation for a good shop in your area. Friends or coworkers may know someone.
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