Thanks for the suggestions.
Around 7-12 months ago I replaced the crank sensor with a new budget brand Intermotor, I think off ebay and yesterday it wouldn't start so fitted the old one and it fired right up but rpm issues and spluttering after so many miles.
When I start it fires right up but the rpm needle doesn't seem to move until the engine fires.
From what you are saying the rpm needle should move slightly prior to the engine firing?
What is a good brand to replace the crank sensor with? Yep, a 10mm bolt, not a bad job took me 20 minutes yesterday to put the old one back in. Only changed it as preventative maintenance. Sat in the glovebox since, so could of gone faulty.
Many thanks. James.
