hi has anyone found a good solution for 340 code. ive changed camshaft sensor for a used 1, changed air intake valve air mass sensor spark plugs and oil and still the problem persists. when you start the car from cold it runs ok until idle settles down and then the engine revs dip but does not stall even though it sounds like it might conk out. When the revs dip the spanner light comes on. turn car off and start and light is off until the engine dips when driving the car becomes jerky. Im going to try the cam sensor again but im clueless now. i have 5v at the cam sensor end, the earths are good. any ideas