Need help diagnosing engine running rough

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Need help diagnosing engine running rough

700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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Feb 14th, 2022, 17:02	#1
SalvadorP Master Member Last Online: Yesterday 23:06 Join Date: Jul 2021 Location: United Banana Republic of Portugal	Need help diagnosing engine running rough [YOUTUBE]https://youtu.be/1UhOnEHIB6s[/YOUTUBE] https://youtu.be/1UhOnEHIB6s My car runs rough and vibrates a lot at idle and even more at 1500rpm. I've changed plugs, cleaned PCV, changed all filters, ran injector cleaner, etc. The car does have a crack both on front muffler and cat, but why would it only vibrate at idle and 1500? I'm suspecting a dirty MAF or distributor issues but i really dont know. What do you guys think? Seems worse when it rains and today the engine cut out in the morning while idling cold. __________________ Proud owner of a 1997 940 2.3 lpt Manual with 501,000km. Last edited by SalvadorP; Feb 14th, 2022 at 17:05.

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