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Message: <blockquote data-quote="pussy" data-source="post: 36845" data-attributes="member: 60"><p>the hissing sound can't be from your intake manifold..please take time to answer the questions below to know the problem.1.does your engine idle roughly ?2.did you check all your hoses leading into the intake manifold ?3. check your icv for leaks, sometimes the 'c' hose cracks or the plastic connector breaks.4. check your fan belts bearings.. maybe loose5. can be your alternator bearings.6. check your brake vacum hose for cracks or the non return valve7. your gearbox shudders.. - check your 'rubber bunion'- do a ATF flush, flush not drain- cahnge your atf filter- check your gearbox mountings, the small ones further to the back is most prone to breakage.. it last for one year or most.. let us know..regards.pussy <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>