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 3-Series Idle speed hi i have swapped m42 from 95 into 92 model everything plugged up right. swapped intake manifold since its different. i have problem when i give it a gas shrinks the intake boot like sucks it in. rough idle as well. what could it be ? new spark plugs new fuel pump all coils fires. __________________ This post was auto-generated based upon a question asked on our tech article page here: BMW E30 3-Series Idle Speed Troubleshooting (1983-1991) | Pelican Parts DIY Maintenance Article | 
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 The duct may be weak from oil contamination or the intake air filter is plugged.  - Nick | 
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