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Discussion Starter #1
Hello everyone my car has always had an intermittent rough idle. It shakes the car a little and has a misfire. This doesn’t always happen. Also under load the car sometimes stutters aswell and miss fires. Timing was checked a few months ago and was okay. Also car runs full power as it’s been on the Dyno recently. Could it be the crank or cam sensor? Or post cat lamba? Hope someone can help.
 

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Discussion Starter #3
Yes plugs where replaced not so long ago. I serviced the car when I bought it they where replaced at the same time. Cars done around 7k in new plugs but it had a rough idle not long after I bought it.
 

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What i mean is not if they have been changed, but if you have looked at the colour of the plugs recently to help you diagnose ignition or engine faults. check There are plug charts to look up colours and symptoms online.
It will at least rule out various engine issues.
Another issue with idling problems is carbon build up on the inlet valve making it sticky. Just needs a clean with cleaner.
https://youtu.be/vFhoNykgQtc
https://youtu.be/T-6DrAaDeSY





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