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Surging 2003 Buick Rendezvous

the first problem is dash boared keeps flickering an surgeing an car is draining an ireplaced the altenatore an battery an the starter an map sensor an ignition control module an ignition switch. please help the second thing is I replaced the intake manifold an the carstarts like its drumming real hard what causes that

Hate to put it this way but…It sounds like you have no clue what is wrong, what the repairs should be, and to top it off you are probably just making things worse by throwing random parts at the problem. Go see a real mechanic.

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My top of the head guess is a bad body control module but I have to agree. Take it to a professional you trust.